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3b + 1c = 75 |x3
2b + 3c = 85
9b + 3c = 225
kemudian dikurangi
-7b = -140
b = -140/-7 = 20
kalo mau cari C pake salah satu persamaan awal.
2(20) + 3c = 85
b diganti dengan 20.
40 + 3c = 85
3c = 85 - 40
3c = 45
c = 45/3 = 15
Semoga membantu!!
3b + 1c = 75 | x3 | 9b + 3c = 225
--------------------- --
-7b = -140
b = - 140 \ -7
= 20
2b+3c = 85 | x3 | 6b+9c = 225
3b+1c = 75 | x2 | 6b +2c = 150
---------------------- --
7c = 75
c = 75\7