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

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

For

*y*= 2 + 3*x*when*x*= 4, what does*y*equal?

Rewrite the expression, substituting in the known variable.

*y*= 2 + 3(4)*y*= 2 + 12*y*= 14

For

*a*= 4 – 5*c*when*c*= –, what does *a*equal?

See part (a) for a strategy to evaluate this expression.

Remember to pay attention to negative signs.*a*= 6.5

For

*n*= 3*d*^{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

For

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

Refer to parts (a) and (c).

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.