Over Lesson 4–3 A.A B.B C.C D.D 5-Minute Check 1 x = -3 Solve x – 3 = –6. Check your solution. Solve y + 9 = 7. Check your solution. y = -2 Solve –13 =

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Presentation transcript:

Over Lesson 4–3 A.A B.B C.C D.D 5-Minute Check 1 x = -3 Solve x – 3 = –6. Check your solution. Solve y + 9 = 7. Check your solution. y = -2 Solve –13 = x – 9. Check your solution. x = -4

Splash Screen

Then/Now You have already solved equations using addition and subtraction. (Lesson 4–3) Solve equations by using the Division Property of Equality. Solve equations by using the Multiplication Property of Equality.

Concept A D.P.E

Example 1 Solve Equations by Dividing Step 1: Write the equation. Solve 7w = 161. Step 2+3: Line through =; D.P.E. Step 5: Give solution Step 4: Do the math Answer: The solution is 23.

Example 2 Solve Equations by Dividing Step 1: Write the equation. Solve 7x = –56. Check your solution and graph it on a number line. Step 2+3: Line through =; D.P.E. Step 4: Do the math. Step 5: Give solution

Example 2 Solve Equations by Dividing To check your solution, replace x with –8 in the original equation. Answer: The solution is –8. The sentence is true. Check Write the equation. Replace x with –8. ?

A.A B.B C.C D.D Example 1 A.–132 B.–10 C.10 D.132 Solve 12p = 120.

A.A B.B C.C D.D Example 2 A.–48 B.–3 C.3 D.48 Solve 4x = –12. Check your solution.

Example 3 Solve an Equation by Dividing HOBBIES Esteban spent $112 on boxes of baseball cards. He paid $14 per box. Write and solve an equation to find how many boxes of cards Esteban bought..

Example 3 Solve an Equation by Dividing Step 1: Write the equation. Step 2+3: Line through =; D.P.E. Step 4: Do the math Step 5: Give solution

Example 3 Solve an Equation by Dividing Check 14b = 112Write the equation. To check your solution, replace b with 8 in the original equation. ? 14(8) =112Replace b with = 112The sentence is true. Answer: Therefore, Esteban bought 8 boxes of cards.

A.A B.B C.C D.D Example 3 A.3d = 27, 9 dozen B.27d = 3, 9 dozen C.9d = 27, 3 dozen D.27d = 9, 3 dozen DOUGHNUTS Eliza spent $27 on doughnuts. She paid $3 per dozen. Write and solve an equation to find how many dozens of doughnuts Eliza bought.

Concept B M.P.E.

Example 4 Solve Equations by Multiplying Step 1: Write the equation. Solve. Check your solution. Step 5: Give solution Step 2+3: Line through =; M.P.E. 1y = 60 Step 4: Do the math

Example 4 Solve Equations by Multiplying Check Answer: The solution is 60. Write the equation. The sentence is true. Replace y with 60. ?

A.A B.B C.C D.D Example 4 Solve Check your solution. A.–36 B.–5 C. D.36

Example 5 Solve Equations by Multiplying by the Reciprocal Step 1: Write the equation. Step 5: Give solution 1x = 12 Step 2+3: Line through =; Use the Reciprocal Step 4: Do the math

Example 5 Solve Equations by Multiplying by the Reciprocal Answer: The solution is 12. Check Write the equation. The sentence is true. Replace x with 12. ?

A.A B.B C.C D.D Example 5 A.–18 B.–8 C.8 D.18

End of the Lesson