SOLUTION: College placement test practice questions with a section on college mathematics. If {{{ f(x)= (3x-1)/2 }}} and {{{ f^-1 }}} is the inverse of f, what is the value of {{{ f^-1(3) }

Algebra ->  Inverses -> SOLUTION: College placement test practice questions with a section on college mathematics. If {{{ f(x)= (3x-1)/2 }}} and {{{ f^-1 }}} is the inverse of f, what is the value of {{{ f^-1(3) }      Log On


   

Question 879521: College placement test practice questions with a section on college mathematics.
If +f%28x%29=+%283x-1%29%2F2+ and +f%5E-1+ is the inverse of f, what is the value of +f%5E-1%283%29+?
Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!
y = (3x-1)/2
x = (3y-1)/2, y = (2x+1)/3
+f%5E%28-1%29%283%29++=+%282%2A3%2B1%29%2F3 = 7/3