#### Understanding

Students understand that the initial strategic goal in solving systems of linear equations is to produce a single linear equation in one variable that can be solved and used for substitution back into the system.

### What to look for

Students are gaining flexibility in solving systems of equations and recognizing patterns that indicate which method is most efficient for a given system.

### Sample Assessment

Mary is buying tickets for a movie.

- Each adult ticket costs $9.
- Each child ticket costs $5.
- Mary spends $110 on tickets.
- Mary buys 14 total tickets.

Answer: 10 adult tickets and 4 child tickets.