y * (x-1) = z Express as x,
divide both sides by y
(x - 1) = z/y
add 1 on both sides
x = z/y + 1
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It is linear. The highest power is 1 (x = x1, y = y1) so it is linear.
x - y = xydifferentiating wrt x1 - (dy/dx) = x(dy/dx) + y(x + 1)(dy/dx) + y + 1 = 0
x1:y1 = x2:y2 4:-2 = x2:5 x2 = (4*5)/-2 x2 = -10
x has been increased by times 1.625 So: 8*1.625 = 13 which is the value of y when x is 117
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