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8*y = (1/4)*x-9 // - (1/4)*x-9
8*y-((1/4)*x)+9 = 0
(-1/4)*x+8*y+9 = 0
8*y-1/4*x+9 = 0 // - 8*y+9
-1/4*x = -(8*y+9) // : -1/4
x = (-(8*y+9))/(-1/4)
x = 4*(8*y+9)
x = 4*(8*y+9)
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