Answer:
y = 17
Explanation:
The problem is asking for f(x) so we know it's asking for y.
STEP 1 - GRAPH THE PROBLEM:
Just graph the formula (image attached below), usually calculators should be able to do it.
STEP 2 - FIND Y:
We know that we are trying to find where x = 9. If we draw an imaginary line upwards, we get y = 17. It's all about finding the corresponding y value.