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3x + 2y = 11500 (x4) 12x + 8y = 46000
4x + 3y = 16000 (x3) 12x + 9y = 48000
-------------------------------------------------------- -
-y = -2000
y = 2000
3x + 2y = 11500
3x + 2(2000)= 11500
3x + 4000 = 11500
3x = 11500 - 4000
3x = 7500
x = 7500 : 3
x = 2500
jadi harga 2 buku satu pensil adalah 2( 2500) + 2000 = 7000
pensil = y
3x + 2y = 11.500 (x3)
4x + 3y = 16.000 (x2)
sehingga
9x + 6y = 34.500
8x + 6y = 32.000 -
x = 2.500
cari y
3x + 2y = 11.500
(3 x 2.500) + 2y = 11.500
7500 + 2y = 11.500
maka 2y = 11.500-7500= 4.000
maka y = 4000/2 = 2000
2x + y
(2 x 2500) + 2000
5000 + 2000
=7000