Answer:
Check the attachment (image).
Explanation:
The slope is -3, so you have to put a point on the y-intercept (where the line touches the y-axis), or -3. Then you have to put a point 3 down (so -6 on the y-axis), and 1 right (so 1 on the x-axis) since the slope is actually:
-3/1
...now you get a ruler and make a line running through those points (if on paper).