### Home > CCA > Chapter A > Lesson A.1.4 > ProblemA-44

A-44.

Read the Math Notes box for this lesson. Then evaluate each equation below. Homework Help ✎

1. For y = 2 + 3x when x = 4, what does y equal?

• Rewrite the expression, substituting in the known variable.

y = 2 + 3(4)
y = 2 + 12

y = 14

1. For a = 4 – 5c when c = – $\frac { 1 } { 2 }$, what does a equal?

• See part (a) for a strategy to evaluate this expression.
Remember to pay attention to negative signs.

• a = 6.5

1. For n = 3d 2 – 1 when d = –5 , what does n equal?

• Rewrite the expression, substituting in the known variable.

• n = 3(−5)2 − 1
n = 3(25) − 1
n = 75 − 1

• n = 74

1. For v = –4(r – 2) when r = – 1 , what does v equal?

• Refer to parts (a) and (c).

1. For 3 + k = t when t = 14, what does k equal?

• Rewrite the problem, substituting in the known variable and then rearrange the problem to make it equal to the unknown variable.