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Big Ideas Math: Modeling Real Life, Grade 7
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Big Ideas Math: Modeling Real Life, Grade 7 View details
4. Writing and Solving Proportions
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Exercise 2 Page 208

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

Proportional

Practice makes perfect
Two quantities are proportional if there is a constant unit rate or ratio each time the values change. To determine if x and y are proportional, let's find the ratios yx for each pair of x and y. If all ratios are the same, x is proportional to y.
x y y/x Value
2/5 3 3/.2 /5. 7.5
4/5 6 6/.4 /5. 7.5
4 30 30/4 7.5

Notice that value of yx is the same for all pairs of x and y. This means x is proportional to y.

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arrow_right Try It p.204-206
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Try It 2 (Page 204)
Try It 3 (Page 204)
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arrow_right Self-Assessment for Concept & Skills p.206
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arrow_right Self-Assessment for Problem Solving p.207
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arrow_right Review & Refresh p.208
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arrow_right Concept, Skills, & Problem Solving p.208-210
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