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 8 Page 205

Solve for the variable by using the Cross Products Property.

y = 2.5

Practice makes perfect
To solve the proportion, we will start by using the Cross Products Property.
12/5 = 6/y
12 * y = 5 * 6
12y = 30
From here, we will continue solving for y by using the Division Property of Equality.
12y = 30
12y/12=30/12
y = 30/12
y = 2.5