himpunan penyelesaian dari SPLDV : x + 2y = 2 dan 3x + 4y = 18 adalah

x + 2y = 2 ..(pers.1)
3x + 4y = 18 ... (pers.2)
x = 2-2y ... (pers.3

subs. pers. 3 ke pers. 2:
3x + 4y = 18
3(2 -2y) + 4y = 18
6 - 6y +4y = 18
6 - 2y = 18
-2y = 18- 6
-2y = 12
y = 12/-2
y = -6

Utk cari nilai x substitusi y = -6 ke pers. 3 :
x = 2 -2y
x = 2 - 2(-6)
x = 2 +12
x = 14

HP = {(14,-6)}