This graph shows matt's progress as he walks in the direction of grandma's house:
nathan walks at a rate of 4 miles per hour. who travels at a faster rate, matt or nathan? how do you know this?

explain the answer
random answer gets reported.

Nathan is walking faster than Matt.

The graph shows that for every hour, Matt walks 3 miles, since it goes to the right 1 and up 3 over and over again.  This means Matt's speed is 3 miles per hour.

4 miles per hour is greater than 3 miles per hour, so Nathan is walking at a faster speed.