The Cooper family and the Nelson family each used their sprinklers last summer. The Cooper family's sprinkler was used for 35 hours. The Nelson family's sprinkler was used for 40 hours. There was a combined total output of 1325L of water. What was the water output rate for each sprinkler if the sum of the two rates was
35L per hour?

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x+y=35
35x+40y=1325
Know how to solve this system of equation?

No I don't

Solve for y by canceling x
You do this by multiplying x+y=35 by (-35)

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