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Big Ideas Math Geometry, 2014

BI

Big Ideas Math Geometry, 2014 View details

Maintaining Mathematical Proficiency

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Exercise 1 Page 357

Solve for (7-x) first.

x=3

Practice makes perfect

We want to solve the given equation by interpreting (7-x) as a single quantity. This means we should solve for 7-x first.

4(7-x)=16

.LHS /4.=.RHS /4.

4(7-x)/4=16/4

Calculate quotient

7-x=4

Once we know the value of 7-x, we can the remaining equation to solve for x.

7-x=4

LHS+x=RHS+x

7-x+x=4+x

Add terms

7= 4+x

LHS-4=RHS-4

7-4=4+x-4

Subtract terms

3=x

Rearrange equation

x=3

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Exercises p.357