Find at least 3 solutions for the following linear equation in two variables: x + y + 4 = 0

x + y + 4 = 0
Take x = 1,
1 + y + 4 = 0
⇒ y + 5 = 0
  ∴ y = -5
Take x = 2,
2 + y + 4 = 0     ⇒ y = -2-4 = -6     ∴ y = -6
Take x = 3,
3 + y + 4 = 0     ∴ y = -4-3 = -7
∴ The three solutions of the given equation are x = 1, y = -5; x = 2, y = -6 and x = 3, y = -7.