Need help on finding the line of fit (click on the pic to get a better look at the picture)

What is the name used to describe a graph where for some value of x, there exists 2 or more different values of y?

If f(x) = 2x - 6 and g(x) = 3x + 9, find (f - g)(x). a. (f-g)(x) = x + 15 o o b. (f- g)(x) = -x - 15 o c. (f- g)(x) = 5x + 3 o d. (f- g)(x) = -x+3 submit

If you answer 2+2 you will get over 80 points