Mark a point on a grid representing where he starts . Draw a line 5 units up (north), 3 units left (west), 8 units down (south), 7 units right (east).
Now you have a starting point and an ending point. The distance between two points and is given by the formula . Can you solve this now?
You can also do it in your head if you want. 5-8 = -3, so he walked a net distance of 3 miles south. 7-3 = 4, so he walked a net distance of 4 miles east.
If he started at (0,0) he ended at (4,-3) is that what you arrived at?