Write a linear equation in y=mx+b form or ax+by=c form to represent each situation. then, explain why your choice is the best representation.

1. mary is selling popcorn for $5 per bucket and hotdogs for $4.75 each. after 1 hour, she makes $72.50.
2. matt is in charge of selling roses for the valentine's day dance. the roses sell for $3.75 each. he estimates that the expenses for the roses are $25. matt wants to write an equation for the profit.
3. meatface is mixing paint for an art project. he mixes 5 ounces of green paint with every 3 ounces of white paint. he needs 50 ounces of the paint mixture