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Answer :

E is the midpoint of line BC

B is (-2x, -4y), C is (8x, -2y)

Δx = +10x

Δy = +2y

divide both by 2

x = +5x

y = + 1y

add to B

-2x + 5x = 3x

-4y + 1y = -3y

3x, -3y

I assume you got it wrong because you didnt include the x and y