This is the answer...
y=250-25x
y=30+30x
58^(1/2) is √58 if that is what you meant
Hope this picture helps! ;) Ignore the stuff around it ($12 or the triangle)
Compute the slope of the line through (-2, -9) and (-4, -17):

Any line perpendicular to this line will have slope -1/4. The one that passes through (0, 10) satisifes
