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y-70 = (81/2)*(x+0) // - (81/2)*(x+0)
y-((81/2)*(x+0))-70 = 0
(-81/2)*x+y-70 = 0
y-81/2*x-70 = 0 // - y-70
-81/2*x = -(y-70) // : -81/2
x = (-(y-70))/(-81/2)
x = -2/81*(70-y)
x = -2/81*(70-y)
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