If you mean where m=17 then the answer is 3 because 17-5 is 12 and 12/4 is 3.
<span>a. direct variation
A relationship between two variables in which one is a constant multiple of the other. </span>
Just subtract 622 feet from 486 feet to get the change in elevation. The result will be negative because your friend's house is at a lower elevation than yours.
Now find the mean change in elevation per mile by dividing (486 ft - 622 ft) by 4 miles:
-136 ft
----------- = -34 ft/mile
4 mi
You should choose c because parallel lines have the same slope
