Use the vertical line test to determine whether the relation is a function. If not, identify two points a vertical line would pass through.

function

Step-by-step explanation:

The verticle line test is basically seeing if it is a function

It is a function when the verticle line touches only one point on the graph at once

For example, if the graph was a circle, and u drew a verticle line through it, it would touch two points on the graph, so it is NOT a function

But for this parabola, if you draw a verticle line at any point, it only touches one point of the graph, so it is a function