body{margin:0;} noscript{z-index: 10000; position: fixed; display: block; height: 100%; width: 100%; background: #fff;} noscript .fa{font-size: 40px; display:block; color: #daa520;} noscript div{margin-top: 6%; padding-left: 20px; padding-right: 20px; text-align: center;} ! You must have JavaScript enabled to use this site.

Big Ideas Math: Modeling Real Life, Grade 7

BI

Big Ideas Math: Modeling Real Life, Grade 7 View details

5. Solving Inequalities Using Addition or Subtraction

Continue to next subchapter

Exercise 5 Page 155

Use the Multiplication Property of Equality to eliminate the division.

w=- 27

Practice makes perfect

To solve the equation, we have to isolate w on one side. Using the Multiplication Property of Equality, we will multiply both sides of the equation by 3. This will eliminate the division and isolate w.

w/3 = - 9

LHS * 3=RHS* 3

w/3 * 3= - 9 * 3

MoveRightFacToNum

a/c* b = a* b/c

3w/3 = - 9 * 3

Calculate quotient

w = - 9* 3

Multiply

w = - 27

To check that this solution is correct, let's substitute w = - 27 into the original equation and simplify.

w/3 = - 9

w= - 27

- 27/3 ? = - 9

Multiply

- 9 = - 9 ✓

Since the left-hand side and right-hand side are equal, w=- 27 is the correct solution.

Subchapter links

Try It p.152-153

Self-Assessment for Concept & Skills p.153

Self-Assessment for Problem Solving p.154

Review & Refresh p.155

Concept, Skills, & Problem Solving p.155-156