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The solution of y-x=2 is a line through the points (0,2) and (-2,0).
The slope of the line passing through any two points with coordinates x,y and x',y' is (y' - y)/(x' - x). In this instance, the slope is (5 - 4)/(0 - 2) = -1/2 .
y=x
The equation is x = 2
its a straightline. All points y where x is equal to 100. So its a vertical line covering the whole real line in the Y plane through x = 100