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Big Ideas Math: Modeling Real Life, Grade 8

BI

Big Ideas Math: Modeling Real Life, Grade 8 View details

4. Rewriting Equations and Formulas

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Exercise 15 Page 29

Apply inverse operations to isolate y.

y=2/3-4/9x

Practice makes perfect

To solve the given literal equation for y, we will use the Properties of Equality to apply inverse operations on the equation. Remember, only like terms can be combined.

6=4x+9y

LHS-4x=RHS-4x

6-4x=4x+9y-4x

Subtract term

6-4x=9y

.LHS /9.=.RHS /9.

6-4x/9=9y/9

▼

Simplify left-hand side

Write as a difference of fractions

6/9-4x/9=9y/9

a/b=.a /3./.b /3.

2/3-4x/9=9y/9

MovePartNumRight

a* b/c=a/c* b

2/3-4/9x=9y/9

Calculate quotient

2/3-4/9x=y

Rearrange equation

y=2/3-4/9x

Subchapter links

Try It p.26-27

Self-Assessment for Concepts & Skills p.27

Self-Assessment for Problem Solving p.28

Review & Refresh p.29

Concepts, Skills, & Problem Solving p.29-30