The Washington family and the Evans family each used their sprinklers last summer. The water output rate for the Washington family's sprinkler was 35L per hour. The water output rate for the Evans family's sprinkler was 40L per hour. The families used their sprinklers for a combined total of 65 hours, resulting in a total water output of 2425L. How long was each sprinkler used?

a function could be identified in 3 ways either on a chart,graph, or ordered pairs. first a function is that each point has its own. the rule is that there can be many x's to one y but there can not be 2 x's at different y's. so on a graph when you put a straight line through the y's there should be one dot only to be a function.

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