Question

2x - 3y = -18, xy = -12; 3) x² + y² = 65, xy = 28. 2) 2x² - 3y² = -19, xy = -6

Answer 1

1. (x₁,y₁)=(-6,2)
(х₂,у₂)=(-3,4)

2. (x₁,y₁)=(-2,3)
(х₂,у₂)=(2, -3)

3. (x₁,y₁)=(-4, -7)
(х₂,у₂)=(4,7)
(x₃,y₃)=(-7,-4)
(x₄,y₄)=(7,4)