Question

помогите решить систему уровнений
(x-y=2
(xy=3

Answer 1

x=y+2
y²+2y-3=0
y=1
x=3
y=-3
x=-1

Answer 2

(x-y=2
(xy=3

( x= y+2
( y(y+2) - 3 = 0 

y^2 + 2y - 3 = 0 
Δ = 4 + 4*3 = 12 + 4 = 16 
y1 = ( - 2 +4)/2 = 1
y2 = ( - 2 - 4)/2 = - 3 

( x= 3
( y = 1 

( x= -1
( y = - 3