y = -2x
In y = mx + b form, the slope is in the m position and the y int is in the b position.....notice how u have no number in the b position....this means that ur line is going thru the origin (0,0).
So start at (0,0)...and since u have a slope of -2....u go down 2 spaces, and to the right 1 space...plot that point....then down 2, and to the right 1....plot that point.....continue doing this and u will see ur line...and just connect the dots that u have plotted
