5x + 7y = 13 2x - y = 9 dengan cara metode gabungan eliminasi dan substitusi

5x + 7y = 13
2x - y = 9 |x 7|

5x + 7y = 13
14x - 7y = 63
------------------ +
19x = 76
x = 4

Subtitusi x = 4 ke 2x - y = 9
2(4) - y = 9
y = 8 - 9
y = -1

HP : { 4 , -1 }

Eliminasi
5x+7y=13 x 1 | 5x+7y = 13
2x-y =9 x7 | 14x+7y=63
-------------------------------------+
19x=76
x=4
Subtitusi
5x+7y=13
5(4)+7y=13
20+7y=13
7y=13-20
y=-1
{HP = 4,-1}