There's more than one way to do this.
You could solve for y, and then you'll have the y-intercept and slope. That's enough to plot a second line.
Or, perhaps easier, you could just calculate both intercepts directly, plot those two points, and draw a line through them.
You know that the intercepts take the form (x, 0) and (0, y), right?
In other words, substitute zero for y, and solve for the x-intercept.
Substitute zero for x, and solve for the y-intercept.