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2x + y = 14 Ix4I
3x + 4y = 31
8x + 4y = 56
____________ _
- 5x = - 25
x = 5
2x + y = 14
2 x 5 + y = 14
10 + y = 14
y = 4
maka x = 5 , y = 4
semoga benar
2x+y=14 |×4| 8x+4y=56
-------------------------------(-)
- 5x = - 25
x = 5
2x + y = 14
2 . 5 + y = 14
10 + y = 14
y = 14 - 10
y = 4