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y(x-4) = 4x+1
xy-4y = 4x+1
xy-4x = 4y+1
x(y-4) = 4y+1
f-¹(x) = 4x + 1/ x - 4
4x + 1 = xy - 4y
4y + 1 = xy - 4x
4y + 1 = x (y - 4)
x = (4y + 1) / (y - 4)
Invers f(x)
= (4x + 1) / (x - 4)