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Halloween Warm-Up Paul has two dozen Halloween cookies. He will eat three cookies on Sunday. On every day that follows, he will eat a number of cookies.

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Presentation on theme: "Halloween Warm-Up Paul has two dozen Halloween cookies. He will eat three cookies on Sunday. On every day that follows, he will eat a number of cookies."— Presentation transcript:

1 Halloween Warm-Up Paul has two dozen Halloween cookies. He will eat three cookies on Sunday. On every day that follows, he will eat a number of cookies that is one greater than the day before. On what day will he find that he doesnt have enough cookies to follow this procedure?

2 Answer Thursday Sun -3 Mon- 4 Tues- 5 Wed cookies eaten = 6 cookies left over, but on Thursday he needs to eat 7 cookies to continue his pattern.

3 Solving Two- Step Equations Lesson 4-4

4 Rules to Remember When solving an equation, the goal is to get the variable by itself. Addition and Subtraction are inverse operations. (opposites) Multiplication and Division are inverse operations. (opposites)

5 Dont Forget The equation is like a balance scale. Whatever you do to one side of the equation must be done to the other side of the equation.

6 How to solve two-step equations Undo the operations in the reverse order of the order of operations. You are using the work back-words strategy In order of operations we do multiplication or division first, then addition and subtraction. When solving an equation we do the opposite!

7 Integer Rules to Remember Adding Integers 1.Same sign= add and keep the sign 2.Different sign = subtract and keep the sign of the larger number Subtracting Integers 1.Keep, Change, Change 2.Follow the rules for addition Multiplying and Dividing Integers 1.Same Sign = Positive Answer 2.Different Sign = Negative Answer

8 Lets Try One… 3x + 2 = x = x = 7 The problem contains addition and multiplication. Which one do we undo 1 st ?

9 Another Example -2y – 7 = y = y = -5 The problem contains subtraction and multiplication. Which one do we undo 1 st ?

10 Last Example -3c + 9 = c = c = 2 The problem contains addition and multiplication. Which one do we undo 1 st ?

11 Now its your turn 1.5x + 4 = t + 7 = m + 1 = w – 4 = y + 3 = t – 13 = 2 1.x = 3 2.t = -4 3.m = -4 4.w = -3 5.y = 4 6.t = 5

12 Homework Complete Lesson 4-4 # 2-24 evens


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