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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 22 Page 131

Use the Addition Property of Equality to eliminate the subtraction.

d=- 5.9

Practice makes perfect

To solve the equation, we have to isolate d on one side. Using the Addition Property of Equality, we will add 3.4 to both sides of the equation. This will eliminate the subtraction and isolate d.

- 9.3 = d - 3.4
AddEqn

LHS+3.4=RHS+3.4

- 9.3 + 3.4 = d - 3.4 + 3.4
AddTerms

Add terms

- 5.9 = d
RearrangeEqn

Rearrange equation

d = - 5.9

To check that this solution is correct, let's substitute d=- 5.9 into the original equation and simplify.

- 9.3 = d - 3.4
Substitute

d= - 5.9

- 9.3 ? = - 5.9 - 3.4
SubTerm

Subtract term

- 9.3 = - 9.3 ✓

Since the left-hand side and right-hand side are equal, d=- 5.9 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
Self-Assessment for Concept & Skills 5 (Page 129)
Self-Assessment for Concept & Skills 6 (Page 129)
Self-Assessment for Concept & Skills 7 (Page 129)
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arrow_right Self-Assessment for Problem Solving p.130
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arrow_right Review & Refresh p.131
Review & Refresh 1 (Page 131)
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arrow_right Concept, Skills, & Problem Solving p.131-132
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