graph the line y = 3.

Explanation:

Step1: Analyze the equation

The equation $y = 3$ represents a horizontal line. For any value of $x$, the value of $y$ is always 3.

Step2: Plot points

We can choose some arbitrary $x$ - values, say $x=-2,-1,0,1,2$. When $x = - 2,y = 3$; when $x=-1,y = 3$; when $x = 0,y = 3$; when $x = 1,y = 3$; when $x = 2,y = 3$.

Step3: Draw the line

Connect these points with a straight - line. This line is parallel to the $x$ - axis and passes through the point $(0,3)$ on the $y$ - axis.

Answer:

Draw a horizontal line passing through the point $(0,3)$ on the $y$ - axis.