Lisa drove to the mountains last weekend. There was heavy traffic on the way there, and the trip took 9 hours. When Lisa drove home, there was no traffic and the trip only took 4 hours. If her average rate was 40 miles per hour faster on the trip home, how far away does Lisa live from the mountains?

no no or no no no no no no no no no no no no

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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