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Question 1195886: Read the description of the below relation and decide whether it is a function.
An engineer tests different models of cars to determine which car has the best mileage. He records the miles per gallon of each model of car.
Answer by greenestamps(13200)   (Show Source):
You can put this solution on YOUR website!
This one is not defined well enough.
If the engineer tests a single car of each model type (not a very good way!), then each model type will have a single value for the mpg, and the relation will be a function.
If the engineer performs a reasonable test to compare mpg for different models of cars, then the relation will not be a function, because the mpg values for different cars of a given model type will (almost certainly) be different. One input (model type) with difference outputs (mpg) means it is not a function.
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