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5 Minute Check

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Solve and show work. 1. x + 5 = 11

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5 Minute Check Solve and show work. 1. x + 5 = 11 -5 = -5 x + 0 = 6

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5 Minute Check Solve and show work. 2. 45 + c = 74

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5 Minute Check Solve and show work. 2. 45 + c = 74 -45 = -45 0 + c = 29

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5 Minute Check

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Flashcards

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Wednesday, Nov 12 Lesson 6.7.3 Solve and Write Subtraction Equations

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Objective: To understand, solve and write subtraction equations.

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Solve and Write Subtraction Equations An equation is a mathematical sentence showing two expressions are equal. An equation always has an equal sign. e.g. x – 2 = 4

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Solve and Write Subtraction Equations e.g. x - 2 = 4 The left side = The right side

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Solve and Write Subtraction Equations e.g. x - 2 + 2 = 4 The left side ≠ The right side

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Solve and Write Subtraction Equations e.g. x - 2 + 2 = 4 + 2 The left side = The right side

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Solve and Write Subtraction Equations An equation is only true if both sides are equal. A teeter totter will only be balanced if there is equal weight on both sides

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Solve and Write Subtraction Equations When you replace a variable with a value that results in a true statement, you solve the equation. The value for the variable is the solution to the equation.

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Solve and Write Subtraction Equations A variable is a symbol, usually a letter, used to represent a number.

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Solve and Write Subtraction Equations A variable is a symbol, usually a letter, used to represent a number. A constant is a term without a variable.

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Solve and Write Subtraction Equations Subtraction and Addition Property of Equality states if two expressions are equal and the exact same thing is added to or subtracted from both sides, the two sides will remain equal.

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Solve and Write Subtraction Equations The goal in solving any algebraic equation is to get the variable on one side of the equal sign and a constant on the other side of the equal sign. e.g. x = 55

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Solve and Write Subtraction Equations Solving an algebraic subtraction equation is the same as solving an algebraic addition equation.

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Solve and Write Subtraction Equations What is the opposite of the variable-side constant in the equation? t + 5 = 35

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Solve and Write Subtraction Equations What is the opposite of the variable-side constant in the equation? t + 5 = 35 -5

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Solve and Write Subtraction Equations What is the opposite of the variable-side constant in the equation? w - 78 = 145

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Solve and Write Subtraction Equations What is the opposite of the variable-side constant in the equation? w - 78 = 145 +78

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Solve and Write Subtraction Equations Solve. x – 2 = 3 To Solve an Algebraic Equation. Step 1- Determine which side of the equation has the variable and a constant. Which side has the variable & constant?

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Solve and Write Subtraction Equations Solve. x – 2 = 3 To Solve an Algebraic Equation. Step 1- Determine which side of the equation has the variable and a constant.

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Solve and Write Subtraction Equations Solve. x – 2 = 3 To Solve an Algebraic Equation. Step 2 - Add the opposite of the variable side constant to both sides, making sure to line up the constants. What is constant on the left side?

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Solve and Write Subtraction Equations Solve. x – 2 = 3 To Solve an Algebraic Equation. Step 2 - Add the opposite of the variable side constant to both sides, making sure to line up the constants. What is it’s opposite?

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Solve and Write Subtraction Equations Solve. x – 2 = 3 +2 = +2

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Solve and Write Subtraction Equations Solve. x – 2 = 3 Original Problem +2 +2 x = 5 Work to be shown on homework.

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Solve and Write Subtraction Equations Solve. x – 7 = 5 Do this on your own.

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Solve and Write Subtraction Equations Solve. x – 7 = 5 +7 +7 x = 12

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Solve and Write Subtraction Equations Solve. 9 = a - 5 Do on your own.

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Solve and Write Subtraction Equations Solve. 9 = a - 5 +5 +5 14 = a

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Solve and Write Subtraction Equations Solve. 3.9 = a + 1.5

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Solve and Write Subtraction Equations Solve. 3.9 = a + 1.5 -1.5 -1.5 2.4 = a

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Solve and Write Subtraction Equations Solve. 1 7 x - 3 = 9

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Solve and Write Subtraction Equations Solve. 1 7 x - 3 = 9 1 +3 +3 7 1 x = 9 + 3 7 3 x = 9 + 9 10 x = 9 1 x = 1 9

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Solve and Write Subtraction Equations Solve. 1242 + c = 1517

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Solve and Write Subtraction Equations Solve. 1242 + c = 1517 -1242 -1242 c = 275

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Solve and Write Subtraction Equations Solve. -15 + n = -9

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Solve and Write Subtraction Equations Solve. -15 + n = -9 +15 +15 n = 6

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Solve and Write Subtraction Equations Solve. -561 = s - 9

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Solve and Write Subtraction Equations Solve. -561 = s - 9 +9 +9 -552 = s

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Solve and Write Subtraction Equations Solve. -16 = p - 25

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Solve and Write Subtraction Equations Solve. -16 = p - 25 +25 +25 9 = p

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Solve and Write Subtraction Equations Mike is 9 inches taller than Steve. If Steve is 55 inches tall, write a algebraic equation that could be used to find Mike’s height. Do this on your own.

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Solve and Write Subtraction Equations Mike is 9 inches taller than Steve. If Steve is 55 inches tall, write a algebraic equation that could be used to find Mike’s height. M - 9 = 55 + 9 +9 M = 64

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Solve and Write Subtraction Equations Georgia’s height is 4 inches less than Sienna’s height. Georgia is 58 inches tall. Write and solve a subtraction algebraic equation to determine Sienna’s height. Do this on your own.

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Solve and Write Subtraction Equations Georgia’s height is 4 inches less than Sienna’s height. Georgia is 58 inches tall. Write and solve a subtraction algebraic equation to determine Sienna’s height. S – 4 = 58 +4 +4 S = 62

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Solve and Write Subtraction Equations At age 25, Gherman Titov of Russia was the youngest person to travel into space. This is 52 years less than the oldest person to travel into space, John Glenn. Write and solve a subtraction algebraic equation to determine how old John Glenn was. Do this on your own.

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Solve and Write Subtraction Equations At age 25, Gherman Titov of Russia was the youngest person to travel into space. This is 52 years less than the oldest person to travel into space, John Glenn. Write and solve a subtraction algebraic equation to determine how old John Glenn was. J – 52 = 25 +52 +52 J = 77

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Solve and Write Subtraction Equations Raheem’s rollerblades cost $70.25 less than his bicycle. His rollerblades cost $43.50. Write and solve a subtraction algebraic equation to determine how much his bicycle cost. Do this on your own.

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Solve and Write Subtraction Equations Raheem’s rollerblades cost $70.25 less than his bicycle. His rollerblades cost $43.50. Write and solve a subtraction algebraic equation to determine how much his bicycle cost. b – 70.25 = 43.50 +70.25 +70.25 b = 113.75

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Solve and Write Subtraction Equations Pete is 15 years old. This is 6 years younger than his sister Victoria. Write and solve a algebraic equation to find Victoria’s age.

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Solve and Write Subtraction Equations Pete is 15 years old. This is 6 years younger than his sister Victoria. Write and solve a algebraic equation to find Victoria’s age. V – 6 = 15 +6 +6 V = 21

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Solve and Write Subtraction Equations Alejandra spent her birthday money on a video game that cost $24, a controller for $13, and a memory card for $16. The total tax was $3. Write and solve a algebraic equation to find how much money she gave the cashier if she received $4 change.

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Solve and Write Subtraction Equations Alejandra spent her birthday money on a video game that cost $24, a controller for $13, and a memory card for $16. The total tax was $3. Write and solve a algebraic equation to find how much money she gave the cashier if she received $4 change. A - $56 = $4 +$56 +$56 A = $60

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Solve and Write Subtraction Equations How would you solve 163 – b = 71?

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Solve and Write Subtraction Equations How would you solve 163 – b = 71? 163 – b = 71 +b +b 163 = 71+ b

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Solve and Write Subtraction Equations How would you solve 163 – b = 71? 163 – b = 71 +b +b 163 = 71+ b -71 -71 92 = b

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Solve and Write Subtraction Equations Complete Mid-Chapter Check on page 546 and bring to my desk to get the homework. Homework – Homework Practice 6.7.3 Due Thursday, Nov 13 Mid-Chapter 6.7 Quiz –Thursday, Nov 13

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