Question

I think my teacher might have made a mistake while grading homework. I'd like a second opinion if possible..

Q; The midpoint of line UV is (5,-11). The coordinate of one endpoint are U (3,5). Find the coordinates of the endpoint V.
My answer was V(7,-27)
If I'm wrong can you explain to me why.. sorry I know I'm asking a lot.

Answer 1

my solution:
let the other end point be (x,y)

to get the x:
(x+3)/2 = 5
x+3 = 10
x = 7

to get the y:
(y+5)/2 = -11
x+5 = -22
y = -27
You had that, good job
I agree, your teacher is in error.

Answer 2

Thank you, I'll have to get in contact with my teacher