Louisa went shopping for shirts, and belts. a shirt costs $15, a pait of pants costs $20, and a belt costs $4. if she brought 4 items and spent $54, how many of each item did she buy?

note: this is a try, check and revise question.

Revised: 
Louisa went shopping for shirts, and belts. A shirt costs $15, a pair of pants costs $20, and a belt costs $4. If she brought 4 items and spent $54, how many of each item did she buy? 
so the answer will be
2 pairs of pants
1 shirt

The linear equation is: y=ax+b