Answer: y=-3x or y=-3x+0
Step-by-step explanation:
First of all, we can tell that our y-intercept is zero and we don't have to add that to our finished equation. Next, we can can perform a rise rise over run to find the slope (-3x).
I chose the points (-3, 9) and (-2, 6).
If you like the method y2-y1/x2-x1 you could use the second y value, subtract it by the first and do the same with the x.
Hope this helps!!