### Home > AC > Chapter 3 > Lesson 3.1.2 > Problem 3-13

3-13.

Write the equation represented in each diagram below on your paper. For each part, simplify as much as possible and then solve for . Be sure to record your work on your paper. Explore using the

*3-13a HW eTool*(CPM) and

*3-13b HW eTool*(CPM).

Flip subtraction to addition.

Remove zero pairs.

Combine like terms.

Remove an

-tile from both sides. Add

to both sides. Divide by

on both sides.

Follow the steps in part (a).

Use the eTools below to help solve the problems.

Click the link at right for the full version of the eTool: *AC 3-13a HW eTool*

Click the link at right for the full version of the eTool: *AC 3-13b HW eTool*