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Big Ideas Math: Modeling Real Life, Grade 8

BI

Big Ideas Math: Modeling Real Life, Grade 8 View details

Cumulative Practice

Finish the assignment

Exercise 4 Page 97

Use the Multiplication Property of Equality to eliminate the division.

C

We want to find the value of x that makes the given equation true. 3/4x=12 To do so, we have to isolate x on one side. Using the Multiplication Property of Equality, we will multiply both sides of the equation by 4. This will eliminate the denominator of the fraction and isolate x.

3/4x=12

MoveRightFacToNum

a/c* b = a* b/c

3x/4=12

LHS * 4=RHS* 4

3x/4* 4=12* 4

FracMultDenomToNumber

a/4* 4 = a

3x=12* 4

Multiply

3x=48

.LHS /3.=.RHS /3.

3x/3=48/3

MovePartNumLeft

a* b/c=a*b/c

3x/3=48/3

DenomMultFracToNumber

3 * a/3= a

x=48/3

Calculate quotient

x=16

Therefore, the correct option is C.

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