Y = 4/5x + 30
4/5 because the slope is 4 up, 5 right. 30 is the y-int
1,600 800+800=1,600 this is your answer
The equation of the line is y = -2/3(x) - 4
To find your answer you divide 3 by 2.5 to get 1.2. The scale for the map is 1.2.
Hope this helps,
<em>♥Nikki♥</em>
(P.S. I'm not completely sure about this so you might want to get a second opinion on this particular question.)