Răspuns:
(x + 1)(y - 2) = 3
1x3 = 3
3x1 = 3
-1x-3 = 3
-3x-1 = 3
x+1 = 1 => x = 1-1 => x = 0
y-2 = 3 => y = 3+2 => y = 5
x+1 = 3 => x = 3-1 => x = 2
y-2 = 1 => y = 1+2 => y = 3
x+1 = - 1 => x = -1-1 => x = -2
y-2 = - 3 => y = - 3+2 => y = -1
x+1 = - 3 => x = -3-1 => x = -4
y-2 = -1 => x = -1+2 => y = 1