22. A house painter uses both paint and primer to complete a job. On Monday, the house painter bought 3 cans of paint that each cost the same amount of money. He also bought 2 cans of
primer that each cost the same amount of money. The total cost of the purchase was $90.
a. Write an equation that can be used to find x, the cost in dollars of each can of paint bought
on Monday, and y, the cost in dollars of each can of primer bought on Monday.