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x + 2y = 4... kali 1
6x - 2y = -18
x + 2y = 4
Eliminasi y
7x = -14
x = -2
Substitusikan nilai x ke pers 1
3(-2) - y = -9
-6 - y = -9
-y = -3
y = 3
3x - y = -9 | x2 => 6x - 2y = -18
x + 2y = 4 | x1 => x + 2y = 4 (ditambah)
= 7x = -14
= x = -14/7 = -2
Mensubtitusikan x = -2 ke pers. x + 2y =
4
-2 + 2y = 4
2y = 4 + 2
2y = 6
y = 6/2
y = 3
jadi HPnya {-2,3}