Brainiest be marked, if the answer is correct!!!! Please help!!!

Answer:
f(-3) = 6
Step-by-step explanation:
This question asks one to evaluate the function (f) for input (-3). It is known that the x-axis represents the input, while the y-axis represents the output. Therefore, find (-3) on the x-axis, and then see where the graph of the line is when it meets the value (-3), this value will be the output. In this case, the output is (6).