### Home > CC3 > Chapter 3 > Lesson 3.2.1 > Problem 3-74

3-74.

For the following equations, solve for . Be sure to check your answer, if possible. Show all work.

Subtract

from both sides.

Get the variable on a side by itself.

Solve for

.

Follow the steps in part (a).

How does the negative sign in front of the parentheses change what is inside?

Use a diagram of the Equation Mat or some other method to explain why

. Refer to the Math Notes box in Lesson 2.1.9 if you need more help with using an Equation Mat.