Need help idk what to do

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

Which of the following best describes the figure?

Iwill give brainliest. suppose tommy walks from his home at (0, 0) to the mall at (0, 5), and then walks to a movie theater at (6, 5). after leaving the theater tommy walks to the store at (6, 0) before returning home. if each grid square represents one block, how many blocks does he walk?