x + 2y - 3 = 0
x = 3 - 2y
x² + y² + 2x + y - 5 = 0
(3 - 2y)² + y² + 2(3 - 2y) + y - 5 = 0
9 - 12y + 4y² + y² + 6 - 4y - 5 = 0
5y² - 15y + 10 = 0
y² - 3y + 2 = 0
(y - 1)(y - 2) = 0
y = 1 atau y = 2
y = 1
x = 3 - 2y
x = 3 - 2
x = 1
y = 2
x = 3 - 2.2
x = -1
