Answer:
3rd choice down (the one already selected)
Explanation:
to prove it, plug each value of x in the table into f(x) = x - 6 and check the answers with what is in the y column.
f(-5) = -5 - 6 = -11
f(-8) = -8 - 6 = -14
f(-7) = -7 - 6 = -13
all the numbers in the 3rd choice check out