If a bag of apples costs $3 and a bag of pears costs $5 and you buy 11 bags that costed 45$, then to find out how many bags you bought for each you would need to set up an equation. I go this equation by a being amount of bags of apples and p being amount of bags of pears. since each bag of apples cost $3 and you do not know how many you got you would use 3 times amount of bags of apples (3a) this would be 3a because each bag costs 3 dollars and since you do not know how many bags of pears you bought you would use 5 times the amount of bags of pears (5p) this would be 5p because each bag of pears costs 5 dollars. It equals 45 because you spent $45 total.
