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y-8 = (-1/4)*(x-7) // - (-1/4)*(x-7)
y-((-1/4)*(x-7))-8 = 0
(1/4)*(x-7)+y-8 = 0
1/4*(x-7)+y-8 = 0
1/4*(x-7)+y-8 = 0
1/4*x+y-8-7/4 = 0
1/4*x+y-39/4 = 0
1/4*x+y-39/4 = 0
1/4*x+y-39/4 = 0 // - y-39/4
1/4*x = -(y-39/4) // : 1/4
x = (-(y-39/4))/1/4
x = 4*(39/4-y)
x = 4*(39/4-y)
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