 This video is called Graphing Lines 1. To graph a straight line, you need one of the following. You could have two points on the line. If you have two points on the line, you can simply graph them and connect them with a straight edge and you'll have your line. Otherwise, what you need is a place to start, so you need a starting point and you need the slope. An example of when you can graph a line with a starting point and the slope is right here where it says graph the line that satisfies each condition. We have a slope of negative one-half containing the point to negative one. Well, this point P to negative one can be our starting spot and then from there, once we graph that, we'll apply our slope so we can see what direction the line goes in and what the steepness of it is. So, the point P to negative one is two to the right and one down. And then from there, I'm ready to apply my slope of a negative one-half. So I'll count down one to the right two, down one to the right two for as long as my graph will allow. And I'll also go up one to the left two, up one to the left two for as long as my graph will allow. That gives me a lot of points so it's very easy to connect and to make my line. This line makes sense to me because the slope was a negative. I know my line should be going down from left to right. And sure enough when I plotted the points, it did.