What is the answer for question 3) ? http://postimg.org/image/5keqi162t/

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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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