Question

Help please?

Answer 1

I got (-7,2)

Answer 2

use the formula of the midpoint:
\[P _{\mp}(x _{m},y _{m})=(\frac{ x _{2}-x _{1} }{ 2 },\frac{ y _{2}-y _{1} }{ 2 })\]

Answer 3

We know the mid point, but we want to know the end point.
And we know that the formula gives us the coordinates, so all you have to do is make it equal and solve it for x1 and y1