Okay, so slope is rise over run, and since the line is going up on the right side, it's positive. Rise is going up, so you start at a point on the line and count up until the line hits another point. You go up 1 times, so the rise is 1. Run is counting to the right, so you start off at the point you left off on and count to the right. You go 3 times, so the run is 3. Rise over run is 1/3, so your slope is 1/3.
This is only one of the ways to find the slope on a basic line graph.
Well, look at the graph, and pick any two points from it to get it, hmmm let's see say we can use (0,2) since that's on the line and hmmm (-3,1), those two,
The answer would be C because for every 1 inch, would be 8 miles, so we then multiply the inches by 8 to get to 8 inches, so we then multiply the miles by 8 and we get 64 miles.