Question

Using the vertical line test whether each relation is also a function is this graph a graph of a function?

Answer 1

The test of the vertical line consists in draw a vertical line in the graph, the vertical line test is a visual way to determine if a curve is a graph of a function or not. A function can only have one output, y, for each unique input, x

as we can see it is a function because we only touch one point in x