Question

Solve y=f(x) for x then find the input when the output is 6

f(x)=x+9

Answer 1

x = -3

So to figure this out we can readjust the equation to make it easier to solve

`f(x) = x + 9` is equal to
`x+9 = 6`

From here we can just subtract 9 from both sides and we get our answer!

`x+(9-9) = (6-9)\\x = -3`