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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 7 Page 205

Solve for the variable by using the Cross Products Property.

x = 8

Practice makes perfect
To solve the proportion, we will start by using the Cross Products Property.
2/7 = x/28
CrossMult

Cross multiply

2(28) = 7 * x
Multiply

Multiply

56 = 7x
From here, we will continue solving for x by using the Division Property of Equality.
56 = 7x
DivEqn

.LHS /7.=.RHS /7.

56/7=7x/7
CalcQuot

Calculate quotient

8 = x
RearrangeEqn

Rearrange equation

x = 8
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)
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Try It 6 (Page 204)
Try It 7 (Page 205)
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arrow_right Self-Assessment for Concept & Skills p.206
Self-Assessment for Concept & Skills 14 (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
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Review & Refresh 7 (Page 208)
arrow_right Concept, Skills, & Problem Solving p.208-210
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