The function is .

The above function is constant function and its general form is .

For every value of x, the value of y is 4. The graph of the equation is a horizontal line 4 units up the x - axis.

Make a table.

Use these ordered pairs to graph the equation.

1.  Draw a coordinate plane.

2.  Plot the points on the coordinate plane.

3.  Draw a line through these points.

Since x can be any real number, there is an infinite number of ordered pairs that can be graphed. All of them lie on the line shown.

Notice that every real number is the x - coordinate of some point on the line. So, the domain is all real numbers.

All points have a y - coordinate of 4, so the range of the function is 4.

The the domain of the function is all real numbers and its range is 4 and its graph is