book Maths Puzzle Numerical Ability

Hello my name is josh and i really need help on linear graphs maths homework, my question is to draw a graph of y=4x,forx=-3 HELP i dont understand.

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My problem:
A plane flies 400 miles with the wind and 320 miles against the wind in the same length of time. If the speed of the wind is 20 mph, whqat is the speed of the plane in still air? WHAT IS THE ROOT OF A QUADRATIC FORMULA?