Question

alguem mim ajuda porfavor

Answer 1

x+y = 3
x²+y²=5

x=3-y
x²+y²=5
(3-y)²+y²=5
9-6y+y²+y²=5
9-6y+2y²=5
9-6y+2y²-5=0
4-6y+2y²=0
2(2-3y+y²)=0
2(y²-3y+2)=0
2(y²-y-2y+2)=0
2(y.(y-1)-2(y-1))
2(y-2).(y-1)=0
y-2=0
y-1=0
y=2
y=1
x=3-2
x=3-1
x=1
x=2
(x1,y1)=(1,2)
(x2,y2)=2,1
espero ter ajudado