You have two cars. the first car travels an average of `20` miles on

You have two cars. The first car travels an average of `20` miles on a gallon of gasoline, and the second averages `26` miles per gallon. Suppose you can afford to buy up to `35` gallons of gas this month. If the first car is driven `x` miles, and the second car, `y`, shade the region that gives all possible values of `x` and `y` that will keep you from buying more than `35` gallons of gas this month

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