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x - 4y = 9 ... (2)
Eliminasi persamaan (1) dan (2)
x + 2y = 3
x - 4y = 9
-------------- -
6y = - 6
y = -6/6
y = - 1
Subtitusi y = - 1 ke persamaan (1)
x + 2y = 3
x + 2(- 1) = 3
x + (- 2) = 3
x - 2 = 3
x = 3 + 2
x = 5
Himpunan penyelesaiannya adalah {5, - 1}