Since x forms a straight line with 2 angles, we know that a straight line is 180 degrees. From there we add 40+50+x=180.
Solving for x gives us 90. Since x and y are vertical angles, we know that y also equals 90.
First person here!!!!!!!!!
Well from what i know here's what i would put........
-4 * -2 = 8 - 2 = 6
-4 * -1 = 4 - 2 = 2
-4 * 0 = 0 - 2 = -2
so it does represent a function......I really hope that helped!!