The function is .

The above function is piecewise function.

Graph the constant function for . Since 3 does not satisfy this inequality, began with an open circle at and draw a horizontal ray to the right.

Graph the linear function for .

Substitute the value of in the function .

.

Since 3 does satisfy this inequality, began with an closed circle at and to the left of , graph .

The function graph is

The function is defined for all values of x, so the domain is all real numbers.

The values that are y - coordinates of points on the graph are 2 and all real numbers greater than or equal . So the range is .

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