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x + 3y = 6... pers 2
kalikan persamaan 2 danga x2, maka hasil persamaan liner yg baru adalah
2x - y = 5
2x + 6y = 12
__________ -
0 -7y = 7
y = 7/-7
y = -1
*Subsitusi y = -1 ke pers 1
= 2x - y = 5
2x - (-1) = 5
2x + 1 = 5
2x = 5-1
2x = 4
x = 4/2
x = 2
maka himpunan penyelesaiannya adalah
{-1,2} opsi A