Answer:

Step-by-step explanation:
we have

we know that

substitute

It is not possible if so it wouldn’t be iscosceles
B. 10 square root 5
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4y=-20+3x and 4y=13.6x-20
so
-20+3x=13.6x-20
3x=13.6x
3=13.6 so it is wrong and system doesn’t have solution