How can I tell a graph represents a function?

  it passes the "vertical line test"

Step-by-step explanation:

The graph of a function maps any x-value to only one y-value. That is, no vertical line will intersect the graph in more than one place. When that is true, we say the graph passes the vertical line test.

the anwser is d) 75°

step-by-step explanation:

days of the week

step-by-step explanation:

javier earned more money then kyle, so that won't always be a constant term, but the days of the week do not change so that term is always constant.

edit: i meant