Question

Use the vertical line test to determine whether each graph represents a function. Explain your reasoning.

Answer 1

a) does, but b) does not.

Explanation:

The vertical line test means if a straight line pointed up, not sideways, was placed on the graph going through anywhere on the line, it would only intersect with the line of the graph once. In a), this would be true, but in b), because of the curve over the x-axis, the vertical line would pass through this line twice anywhere it is placed.