I am having difficulties deciding which equation to use to solve In comparing two local well-known DJs for this year's street dance, you see two good choices. DJ Joe charges $100 for each hour of play time. DJ Dan charges a fee of $150, plus $75 an hour of play time.

a. For two hours of play time, what would be the charge for each and who would charge the lesser amount?

b. For eight hours of play time, what would be the charge for each and who would charge the lesser amount?