Question

PLEASE HELP ME ASAP!?!?!?!????? 20 POINTS

You and your friend each start a car-washing service.
You spend $25 on supplies and charge $10 per car.
Your friend spends $55 on supplies and charges $13 per car.
How many cars do you have to wash to earn the same amount of money as your
friend?
cars

y=10z-25
y=13z-55

_cars

Answer 1

10x - 25= 13x - 55

Add 25 on both sides and subtract 13x

-3x = -30 divide both sides by -3

x= 10 cars you have to wash.

Solution

10