Answer:
(-9, -2.5)
Explanation:
Find the average of each corresponding number. If you notice, (x, y) is the layout for points. Therefore, -7 and -11 are your x values. -7 + -11 = -18
-18/2 = -9
Your y values would be 8 and -13. So find their average. 8 + -13) = -5
-5/2 = -2.5