Jika f: R Mendekati R , maka tentukan f-1(×) untuk f(×) = 2×+5 per ×-7

y = (2x+5)/(x-7)
xy - 7y = 2x + 5
xy -2x = 5+7y
x(y-2) = 5+7y
x = (5+7y)/(y-2)
f^-1(x) = (5+7x)/(x-2)