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y-6 = (-5/4)*(x+1) // - (-5/4)*(x+1)
y-((-5/4)*(x+1))-6 = 0
(5/4)*(x+1)+y-6 = 0
5/4*(x+1)+y-6 = 0
5/4*(x+1)+y-6 = 0
5/4*x+y-6+5/4 = 0
5/4*x+y-19/4 = 0
5/4*x+y-19/4 = 0
5/4*x+y-19/4 = 0 // - y-19/4
5/4*x = -(y-19/4) // : 5/4
x = (-(y-19/4))/5/4
x = 4/5*(19/4-y)
x = 4/5*(19/4-y)
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