exam Maths Puzzle Numerical Ability

How do I get to graphs for solving slope intercept proplems?

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This question is confusing me. Please help.

x - 3y is less than or equal to 0
At a given hour, two cars leave a city in the same direction. One travels at 60 mph, and the other travels at 75 mph. In how many hours will the cars be 90 miles apart?