Question

x-2y
xy=3
sistema de equacao do 2 grau

Answer 1

xy = -2 

(2y-4).y = -2 
2y²-4y+2=0 
delta = 16-16 
delta = 0 --> y = -b/2a 
y = 4/4 --> y = 1 

x = 2y-4 
x = 2.1-4 
x = 2-4 
x = -2 

S:{-2, 1}