News
Get Premium
Dashboard

Dashboard Sign out
Big Ideas Math: Modeling Real Life, Grade 7
BI
Big Ideas Math: Modeling Real Life, Grade 7 View details
1. Solving Equations Using Addition or Subtraction
Continue to next subchapter
search

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 âś“
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
1
Try It 2 (Page 128)
Try It 3 (Page 128)
4
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)
8
9
arrow_right Self-Assessment for Problem Solving p.130
10
11
arrow_right Review & Refresh p.131
Review & Refresh 1 (Page 131)
Review & Refresh 2 (Page 131)
Review & Refresh 3 (Page 131)
Review & Refresh 4 (Page 131)
Review & Refresh 5 (Page 131)
Review & Refresh 6 (Page 131)
Review & Refresh 7 (Page 131)
Review & Refresh 8 (Page 131)
9
arrow_right Concept, Skills, & Problem Solving p.131-132
10
Concept, Skills, & Problem Solving 11 (Page 131)
Concept, Skills, & Problem Solving 12 (Page 131)
Concept, Skills, & Problem Solving 13 (Page 131)
Concept, Skills, & Problem Solving 14 (Page 131)
Concept, Skills, & Problem Solving 15 (Page 131)
Concept, Skills, & Problem Solving 16 (Page 131)
Concept, Skills, & Problem Solving 17 (Page 131)
Concept, Skills, & Problem Solving 18 (Page 131)
Concept, Skills, & Problem Solving 19 (Page 131)
Concept, Skills, & Problem Solving 20 (Page 131)
Concept, Skills, & Problem Solving 21 (Page 131)
Concept, Skills, & Problem Solving 22 (Page 131)
Concept, Skills, & Problem Solving 23 (Page 131)
Concept, Skills, & Problem Solving 24 (Page 131)
Concept, Skills, & Problem Solving 25 (Page 131)
Concept, Skills, & Problem Solving 26 (Page 131)
Concept, Skills, & Problem Solving 27 (Page 131)
28
Concept, Skills, & Problem Solving 29 (Page 131)
Concept, Skills, & Problem Solving 30 (Page 131)
Concept, Skills, & Problem Solving 31 (Page 131)
Concept, Skills, & Problem Solving 32 (Page 131)
33
34
35
36
37
38
39
40
41
42
43
44
Concept, Skills, & Problem Solving 45 (Page 132)
Concept, Skills, & Problem Solving 46 (Page 132)
Concept, Skills, & Problem Solving 47 (Page 132)