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3x + 7y = 2 |×2| 6x + 14y = 4
2x + 5y = -3 |×3| 6x + 15y = -9
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- y = 13
y = - 13
Subtitusi y
2x + 5y = - 3
2x = - 3 - 5y
2x = - 3 - 5 (- 13)
2x = 62
x = 31
(x , y) = (31, - 13)
4x + 2y = 4(31) + 2(- 13) = 98