DashboardNewsSettingsHelp
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
3. Solving Two-Step Equations
Continue to next subchapter

Exercise 9 Page 141

Start by combining the variable terms.

m=10

Practice makes perfect

To solve an equation, we should first gather all of the variable terms on one side and all of the constant terms on the other side using the Properties of Equality. In this case, the only variable terms are already on the right-hand side of the equation, so we will start by combining them.

- 8=1.3m -2.1m
SubTerm

Subtract term

- 8=- 0.8m
DivEqn

.LHS /(- 0.8).=.RHS /(- 0.8).

- 8/- 0.8 = - 0.8m/- 0.8
DivNegNeg

- a/- b=a/b

8/0.8 = 0.8m/0.8
CalcQuot

Calculate quotient

10=m
RearrangeEqn

Rearrange equation

m=10

The solution to the equation is m=10. We can check our solution by substituting it into the original equation.

- 8=1.3m -2.1m
Substitute

m= 10

- 8 ? = 1.3( 10) -2.1m( 10)
Multiply

Multiply

- 8 ? = 13-21
SubTerm

Subtract term

- 8 =- 8

Since the left-hand side is equal to the right-hand side, our solution is correct.

Subchapter links expand_more
arrow_right Try It p.140-141
1
Try It 2 (Page 140)
Try It 3 (Page 140)
Try It 4 (Page 140)
Try It 5 (Page 140)
Try It 6 (Page 140)
Try It 7 (Page 141)
Try It 8 (Page 141)
Try It 9 (Page 141)
arrow_right Self-Assessment for Concept & Skills p.141
10
Self-Assessment for Concept & Skills 11 (Page 141)
Self-Assessment for Concept & Skills 12 (Page 141)
Self-Assessment for Concept & Skills 13 (Page 141)
Self-Assessment for Concept & Skills 14 (Page 141)
Self-Assessment for Concept & Skills 15 (Page 141)
Self-Assessment for Concept & Skills 16 (Page 141)
17
arrow_right Self-Assessment for Problem Solving p.142
18
19
arrow_right Review & Refresh p.143
Review & Refresh 1 (Page 143)
Review & Refresh 2 (Page 143)
Review & Refresh 3 (Page 143)
Review & Refresh 4 (Page 143)
Review & Refresh 5 (Page 143)
Review & Refresh 6 (Page 143)
Review & Refresh 7 (Page 143)
Review & Refresh 8 (Page 143)
9
arrow_right Concept, Skills, & Problem Solving p.143-144
10
Concept, Skills, & Problem Solving 11 (Page 143)
Concept, Skills, & Problem Solving 12 (Page 143)
Concept, Skills, & Problem Solving 13 (Page 143)
Concept, Skills, & Problem Solving 14 (Page 143)
Concept, Skills, & Problem Solving 15 (Page 143)
Concept, Skills, & Problem Solving 16 (Page 143)
Concept, Skills, & Problem Solving 17 (Page 143)
Concept, Skills, & Problem Solving 18 (Page 143)
Concept, Skills, & Problem Solving 19 (Page 143)
Concept, Skills, & Problem Solving 20 (Page 143)
Concept, Skills, & Problem Solving 21 (Page 143)
Concept, Skills, & Problem Solving 22 (Page 143)
Concept, Skills, & Problem Solving 23 (Page 143)
24
25
Concept, Skills, & Problem Solving 26 (Page 143)
Concept, Skills, & Problem Solving 27 (Page 143)
Concept, Skills, & Problem Solving 28 (Page 143)
Concept, Skills, & Problem Solving 29 (Page 143)
Concept, Skills, & Problem Solving 30 (Page 143)
Concept, Skills, & Problem Solving 31 (Page 143)
32
Concept, Skills, & Problem Solving 33 (Page 144)
Concept, Skills, & Problem Solving 34 (Page 144)
Concept, Skills, & Problem Solving 35 (Page 144)
Concept, Skills, & Problem Solving 36 (Page 144)
37
38
39
40
41
42