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[3 -6] [y] = [2]
5x + 4y = 1 (× 3)
3x - 6y = 2 (× 5)
15x + 12y = 3
15x - 30y = 10
___________ -
42y = -7
y = -7/42 = -1/6
3x - 6y = 2
3x - 6(-1/6) = 2
3x + 1 = 2
3x = 2 - 1
3x = 1
x = 1/3
x + 2y
= 1/3 + 2(-1/6)
= 1/3 - 1/3 = 0 (C)
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