Yesterday, a movie theater sold 301 bags of popcorn. a large bag of popcorn costs $3. a small bag of popcorn costs $1. in all, the movie theater made $507 from popcorn sales. write and solve a system of equations to find how many bags of each size of popcorn were sold.

s-small popcorn $1
L- large popcorn $3
Total money-$507
Total bags-301
Equation:
3L+1S=$507
L+S=301     subtract by substituting

2L=206    divide
L (or y)=103

3(103)+1S=507   replace"L" for 103, then multiply
309+1S=507       subtract 309 from 507
1S=198>  S(or x)=198
Coordinates are
(198,103)
Hope this helps...
Enjoy and Merry Early Christmas