If you simplify the equation down into slope intercept form you get y = -2x + 4
So essentially, slope intercept is
y = mx + b
Where m is the slope and b is the y intercept.
Hopefully you know what the y intercept is. If not, just ask.
The slope, m, is the change in y over the change in x. Basically, it means, the number of units you move up, down, left, or right from one point to another.
In this case, the slope is 4, so to graph this, you'd move 4 units up, and 1 unit to the right (because 4 is equal to 4/1) and you can keep adding points by using the slope.
You really only need one, since you can get a line by connecting the y intercept and one point.
Ask if you need any clarification
