x = 2y+7 / 9y-5

9xy-5x = 2y+7

9xy-2y = 5x+7

y(9x-2) = 5x+7

y = 5x+7 / 9x-2

therefore, f-1(x) = 5x+7 / 9x-2

Check:

f(f-1(x)) = 2(5x+7/9x-2)+7 / 9(5x+7/9x-2)-5

= 10x+14+63x-14 / 45+63-45x+10

= 73x/73 = x Therefore it checks out as the inverse

Secure Information

Content will be erased after question is completed.

Enter the email address associated with your account, and we will email you a link to reset your password.

Forgot your password?

Sign Up