are you looking for the equation of the line? since you have two points you can graph the line to get this fairly easily.

There is the graph. The equation can be found by using the form y=mx+b where m is the slope and b is the y intercept.
Slope can be calculated by rise over run which would be 6/-2 which is -3
so the equation for the equation of the line we would get y=-3x-6