Answer:
D(8, -11)
Step-by-step explanation:
You want the coordinates of end point D if C is (2, -3) and the midpoint of CD is M(5, -7).
Midpoint
The midpoint is the average of the endpoint coordinates:
M = (C +D)/2
Solving for D, we find ...
D = 2M -C
End point
Then point D is ...
D = 2(5, -7) -(2, -3) = (2·5-2, 2(-7)+3)
D = (8, -11)
