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x in (-oo:+oo)
(x-400)/(800-400) = (y-1)/(0-1) // - (y-1)/(0-1)
(x-400)/(800-400)-((y-1)/(0-1)) = 0
(x-400)/(800-400)+y-1 = 0
(x-400)/400+y-1 = 0
(x-400)/400+(400*y)/400+(-1*400)/400 = 0
x+400*y-1*400-400 = 0
x+400*y-400-400 = 0
x+400*y-800 = 0
(x+400*y-800)/400 = 0
(x+400*y-800)/400 = 0 // * 400
x+400*y-800 = 0
x+400*y-800 = 0 // - 400*y-800
x = -(400*y-800)
x = 800-(400*y)
x = 800-(400*y)
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