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y = paku
persamaannya
8x + 6y = 14120
6x + 5y = 11120
eliminasi
| x5 | 40x + 30y = 70600
| x6 | 36x + 30y = 66720
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4x = 3880
x = 970 (ampelas)
substitusikan
8x + 6y = 14120
8 . 970 + 6y = 14120
7760 + 6y = 14120
6y = 14120 - 7760
6y = 6360
y= 1060 (paku)
ditanya
5x + 8y = ?
5(970) + 8(1060) = ?
4850 + 8480 = 13330