This document discusses solving systems of linear equations by adding or subtracting. It provides 4 examples of solving linear systems this way and references homework problems 3-21 (odd), 39, 40, and 43 from page 447 for further practice.

1. Section 7.3
Solve Linear Systems By
Adding or Subtracting
I will solve systems of linear equations by adding or
subtracting.

3. Example 1

4. Example 1

5. Example 2

6. Example 2

7. Example 3

8. Example 3

9. Example 4

10. Example 4

11. Page 447
# 3-21 (odd),
39,40,43