to graph straight lines, you only need two points. the x and y-intercepts are usually the easiest points to find, especially if the line is already in the slope-intercept form. so find the two points, and plot them on the the axis, and then draw a straight line through them, and you're done

there are better threads you can search for, as this topic has been discussed numerous times, but after a quick search, i found this. see if it helps