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y-9 = (7/4)*(x-4) // - (7/4)*(x-4)
y-((7/4)*(x-4))-9 = 0
(-7/4)*(x-4)+y-9 = 0
y-7/4*(x-4)-9 = 0
y-7/4*(x-4)-9 = 0
y-7/4*x-9+7 = 0
y-7/4*x-2 = 0
y-7/4*x-2 = 0
y-7/4*x-2 = 0 // - y-2
-7/4*x = -(y-2) // : -7/4
x = (-(y-2))/(-7/4)
x = -4/7*(2-y)
x = -4/7*(2-y)
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