Question

Please please please help!! ASAP

Answer 1

I prefer to use a midpoint formula that deals with both coordinates at once. For points A and B, their midpoint (M) is

... M = (A + B)/2

We can solve this for B by multiplying by 2 and subtracing A.

... 2M = A + B

... 2M - A = B

For your midpoint M(0, -10) and your endpoint A(-4, -5), the other endpoint will be

... B = 2(0, -10) - (-4, -5) = (2·0 -(-4), 2·(-10) -(-5))

... = (4, -15)