Answer:
B = (7,4)
Step-by-step explanation:
To find the midpoint, take the two points add them together and divide by 2
let point B be (x,y)
First find the x point
(-2+x)/2 = 2.5
Multiply each side by 2
-2+x = 5
Add 2 to each side
-2+2+x=5+2
x = 7
Now find the y point
(-7+y)/2 = -1.5
Multiply each side by 2
-7+y = -3
Add 7 to each side
-7+7+y=-3+7
y = 4
B = (7,4)
