Question

Resolva o sistema: -x^1+y^2=1 x^2+y^2=1

Answer 1

x²+y²=1 (I)

-x²+y²=1 (II)  

Fazendo (I)+(II):

x²-x²+y²+y²=1+1

2y²=2

y²=1 -> y = +-1 -> y=1 ou y=-1

x²+y²=1

x²+1=1

x²=0 -> x = 0

Logo, temos x = 0 e y = 1 ou -1.