Answer:
The other coordinate is (-6,19)
Step-by-step explanation:

(4,-7)
(x,y)
[(4+x)/2 , (-7+y)/2] = (-1,6)
(4 + x)/2 = -1
4 + x = -2
× = -6
(-7 + y)/2 = 6
-7 + y = 12
y = 19
(Correct me if i am wrong)
I hope you can understand what i wrote
For math- The difference between a value of a variable and another variable which usually ends up to be the variables mean
All you do is subtract the two numbers
A because it’s less likely to be a freshman