Answer:
1st picture: DE: (-8,8.5).
DC:( -8,2.5)
AB:(-8.5, 6.5)
AC: (-8.5, 2.5)
2nd picture: -3/2
3rd picture answer is: AC=4/2=2 and DE=6/3=2
I am not sure about those answer but please tell me if it helps you
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