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Take note that f(x) = y.
So, we can write the function as:y = 3x - 7.
To take the inverse function, we will swap the x and y, and then solve for y.
`x = 3y - 7`
Isolate the term with "y" on one side. We can do this by adding 7 on both sides.
`x + 7 = 3y`
Divide both sides by 3.
`y = (x + 7)/3`
Therefore the final answer is: f ^-1(x) = (x + 7)/3.
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