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

6. Scale Drawings

Continue to next subchapter

Exercise 1 Page 221

Two quantities are proportional if there is a constant unit rate, or ratio, each time the values change.

No, see solution.

Practice makes perfect

Two quantities are proportional if there is a constant unit rate or ratio each time the values change.

x	10	9	8	7
y	5	4	3	2
Ratioy/x	5/10	4/9	3/8	2/7

Now, we can rewrite all ratios as decimals. We can do so using a calculator.

x	10	9	8	7
y	5	4	3	2
Ratioy/x	5/10	4/9	3/8	2/7
Simplified Ratioy/x	0.5	0.4	0.375	0.285714...

Notice that the ratio for all four pairs is different. This means that x and y are not proportional.

Subchapter links

Try It p.218-219

Self-Assessment for Concept & Skills p.219

Self-Assessment for Problem Solving p.220

Review & Refresh p.221

Concept, Skills, & Problem Solving p.221-222