Which equation can be solved to find one of the missing side lengths in the triangle?

it should be Ddue to the fact that opposite over adjacent for the missing length

the answer is (-8,-5)

step-by-step explanation:

the endpoint to midpoint is half the length. the length is (-2,-1) so when you are at the midpoint just add it to it to find your answer -6+(-2)= -8 and -4+(-1)=-5 so (-8,-5)