Answer: 12 unit^2 ================================== working: area of triangle = base x height
to find the base: 4 - (-2) = 4 + 2 = 6
to find the height: 5 - 1 = 4
to find the area fo the triangle: 4 x 6 x 0.5 = 12
I think you should know how I found the base but for the height, picture a perpendicular line going down to the bottom of the triangle, it will be touching (1,1). Therefore, I used 5 from (1,5) minus 1 from (1,1)
The answer is the third one (C?) because if you started at 0, you are going below it since you are losing yards, causing you to have less and less yards. Adding two negatives gives you a lesser amount.
