9. Mr. Martinez is buying equipment for his school's computer lab. He has a budget of $7500. New desktop
computers cost $600 each and new tablets cost $500 each. Which equation represents how much equipment
Martinez can buy with his budget?
a. 7500x + 600y = 500
c. 600x + 500y = 7500
b. 7500 + 600x = 500y
d. 600x = 500y + 7500​