The equation is .

Make a table:

The ordered pairs are.

Graph:

Graph of the equation is .

Plot the points are and .

Observe the graph:

Every real number is the -coordinate of some point on the line.

So, the domain (-coordinates on the line) is set of all real numbers.

Every real number is the -coordinate of some point on the line.

So, the range (-coordinates on the line) is also set of all real numbers.

Vertical line test:

Draw the vertical lines through the points.

Observe the graph:

There is  vertical line that contains more than one point.

The equation does not passes the vertical line test.

The equation represents not a function.

The equation is not a function.