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Big Ideas Math: Modeling Real Life, Grade 7

BI

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

5. Graphs of Proportional Relationships

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Exercise 25 Page 216

Check whether the given function is in the form of y=kx or can be written in the form of y=kx.

Is x and y proportional? No.
Explanation: The equation cannot be written as y=kx.

Practice makes perfect

We want to determine if x and y are proportional. 8=xy Since the given function is not in the form of y= kx, let's try to rewrite it in this form by isolating y.

8=xy

.LHS /x.=.RHS /x.

8/x=y

Rearrange equation

y=8/x

The given function cannot be written in the form of y= kx. Therefore, we can say that x and y are not proportional.

Subchapter links

Try It p.212-213

Self-Assessment for Concept & Skills p.213

Self-Assessment for Problem Solving p.214

Review & Refresh p.215

Concept, Skills, & Problem Solving p.215-216