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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 2 Page 128

Use the Subtraction Property of Equality to eliminate the addition.

w=- 2.8

Practice makes perfect

To solve the equation, we have to isolate w on one side. Using the Subtraction Property of Equality, we will subtract 13.2 from both sides of the equation. This will eliminate the addition and isolate w.

w + 13.2 = 10.4
SubEqn

LHS-13.2=RHS-13.2

w + 13.2 - 13.2 = 10.4 - 13.2
SubTerm

Subtract term

w = - 2.8

To check that this solution is correct, let's substitute w=- 2.8 into the original equation and simplify.

w + 13.2 = 10.4
Substitute

w= - 2.8

- 2.8 + 13.2 ? =10.4
AddTerms

Add terms

10.4 = 10.4 ✓

Since the left-hand side and right-hand side are equal, w=- 2.8 is the correct solution.

Subchapter links expand_more
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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