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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 13 Page 208

Solve for the variable by using the Cross Products Property.

y = 16, see solution.

Practice makes perfect
Notice that in the given equation y is only present within the denominator of a single fraction. 3/4 = 12/yTo solve this proportion, we will start by using the Cross Products Property. That way we will eliminate fractions and move y from the denominator. Let's do it!
3/4 = 12/y
CrossMult

Cross multiply

3 * y = 4 * 12
Multiply

Multiply

3y = 48
From here, we will continue solving for y by using the Division Property of Equality.
3y = 48
DivEqn

.LHS /3.=.RHS /3.

3y/3 = 48/3
DenomMultFracToNumber

3 * a/3= a

y = 48/3
CalcQuot

Calculate quotient

y = 16
Subchapter links expand_more
arrow_right Try It p.204-206
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Try It 2 (Page 204)
Try It 3 (Page 204)
Try It 4 (Page 204)
Try It 5 (Page 204)
Try It 6 (Page 204)
Try It 7 (Page 205)
Try It 8 (Page 205)
Try It 9 (Page 205)
Try It 10 (Page 205)
Try It 11 (Page 205)
Try It 12 (Page 205)
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arrow_right Self-Assessment for Concept & Skills p.206
Self-Assessment for Concept & Skills 14 (Page 206)
Self-Assessment for Concept & Skills 15 (Page 206)
Self-Assessment for Concept & Skills 16 (Page 206)
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arrow_right Self-Assessment for Problem Solving p.207
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arrow_right Review & Refresh p.208
Review & Refresh 1 (Page 208)
Review & Refresh 2 (Page 208)
Review & Refresh 3 (Page 208)
Review & Refresh 4 (Page 208)
Review & Refresh 5 (Page 208)
Review & Refresh 6 (Page 208)
Review & Refresh 7 (Page 208)
arrow_right Concept, Skills, & Problem Solving p.208-210
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