book Maths Puzzle Numerical Ability

We have to slope and figure out the y-intercept in Algebra1 I know how to find the slope and y-intercept but i don't know how to graph!!!

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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 slope of y=1/2x-1/2
y=-1/3x-3