Question

preciso para amanhã as 7h help​

Answer 1

Resposta:

x²-y²=20

x=2y

(2y)²-y²=20

4y²-y²=20

3y²=20    ==>y=±√(20/3)

para y=√(20/3)   ==>x=2*√(20/3)

para y=-√(20/3)   ==>x=-2*√(20/3)

Answer 2

Resposta:

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