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y-4 = (-5/2)*(x-2) // - (-5/2)*(x-2)
y-((-5/2)*(x-2))-4 = 0
(5/2)*(x-2)+y-4 = 0
5/2*(x-2)+y-4 = 0
5/2*(x-2)+y-4 = 0
5/2*x+y-5-4 = 0
5/2*x+y-9 = 0
5/2*x+y-9 = 0
5/2*x+y-9 = 0 // - y-9
5/2*x = -(y-9) // : 5/2
x = (-(y-9))/5/2
x = 2/5*(9-y)
x = 2/5*(9-y)
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