2Y-X= -2,X+Y=7 spldv berikut dengan cara substitusi

2y - x = - 2
- x = - 2y - 2
x = 2y + 2
subtitusi ke pers :
x + y = 7
2y + y = 7
3y = 7
y = 7/3
subtitusi ke pers :
x = 2y + 2
x = 2(7/3) + 2
x = 14/3 + 6/3
x = 20/3

hp = {20/3 , 7/3}