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Matt71
Make x the subject of the formula
y = sqrt((5x + 3)/(x-5)) y^2 = (5x+3)/(x-5) (y^2) * (x-5) = 5x + 3 x*(y^2) - 5*(y^2) = 5x + 3 x*(y^2) - 5x = 3 + 5*(y^2) x*((y^2) - 5) = 3 + 5*(y^2) x = (3 + 5*(y^2)) / ((y^2) - 5)