Himpunan penyelesaian dari {× + y = 3 {Y = ײ - 2× + 1

x + y = 3
y = 3 - x

y = x^2 - 2x + 1
3 - x = x^2 - 2x + 1
x^2 - x -2 = 0
(x - 2).(x + 1) = 0
x1 = 2
x2 = -1

y1 = 3 - x1
y1 = 3 -2
y1 = 1

y2 = 3 - x2
y2 = 3 - (-1)
y2 = 4

HP = {(2,1),(-1,4)}