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pensil = y
2x + 3y = 12.000 | ×1 | 2x + 3y = 12.000
x + 2y = 7.000 | ×2 | 2x + 4y = 14.000 -
-y = - 2.000
y = 2.000
x + 2(2.000) = 7.000
x + 4.000 = 7.000
x = 7.000 - 4.000
x = 3.000
jadi, x + 3y = 3000 + 3(2000) = 3000 + 6000 = 9000
maaf kalo salah
x+2y=7000-
x+y=5000
x+y+y=7000
x+y=5000-
y=2000
x=3000
x+3y
3000+6000=9000