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JAMB 2002 · UME · Q38

The inverse of the function f(x)=3x+4f(x) = 3x + 4 is

Worked solution (try it first)
  1. Write y=3x+4y = 3x + 4 and make xx the subject.
  2. Subtract 4: y−4=3xy - 4 = 3x.
  3. Divide by 3: x=13(y−4)x = \frac13(y - 4).
  4. Rename yy as xx: f−1(x)=13(x−4)f^{-1}(x) = \frac13(x - 4), option D.

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