Question

For questions 1-3, decide for each graph whether the equation shown is a function. Label each graph

with "Function" or "Not a function." In each case, explain how you know.
f(x)
Label:
Explanation:

Answer 1

Answer: Not a function

Explanation:

The graph fails the vertical line test. In other words, when you draw a vertical line anywhere through the curve, the line passes through two points.

Bonus: If you do not have a graph, it is not a function if there is one x-value that has two different y-values.

For example, If (1, 2) and (1, -2) lie on the curve, then it is NOT a function because the x-value (1) has two different y-values (2 & -2).