The slope is y = -2x if you want it in slope intercept format.
To find this, you need to find the rise and run of the line.
So the rise is -6, since it goes down by 6 to hit a point where the coordinates won't be decimals.
The run is 3, since it "runs" to the right by 3 to hit a point where it can stop at an even point.
Now, just plug the numbers in for slope.
̲-̲6̲ ̲
3
That equals -2.
The slope is -2.