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Big Ideas Math: Modeling Real Life, Grade 7
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Big Ideas Math: Modeling Real Life, Grade 7 View details
1. Solving Equations Using Addition or Subtraction
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Exercise 17 Page 131

Use the Addition Property of Equality to eliminate the subtraction.

g=- 10

Practice makes perfect

To solve the equation, we have to isolate g on one side. Using the Addition Property of Equality, we will add 9 to both sides of the equation. This will eliminate the subtraction and isolate g.

g - 9 = - 19
AddEqn

LHS+9=RHS+9

g - 9 + 9 = - 19 + 9
AddTerms

Add terms

g = - 10

To check that this solution is correct, let's substitute g=- 10 into the original equation and simplify.

g - 9 = - 19
Substitute

g= - 10

- 10 - 9? =- 19
SubTerm

Subtract term

- 19 = - 19 ✓

Since the left-hand side and right-hand side are equal, g=- 10 is the correct solution.

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arrow_right Try It p.128-129
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Try It 2 (Page 128)
Try It 3 (Page 128)
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arrow_right Self-Assessment for Concept & Skills p.129
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