1 pensil + 2 buku + 1 penghapus = 6500 2 pensil + 1 buku + 2 penghapus = 7000 2 pensil + 2 buku + 1 penghapus = 8000 ,x+2y+z=6500…(1), 2×+y+2z=7000…(2), 2×2y+z=8000….(3)

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1 pensil + 2 buku + 1 penghapus = 6500 2 pensil + 1 buku + 2 penghapus = 7000 2 pensil + 2 buku + 1 penghapus = 8000 ,x+2y+z=6500…(1), 2×+y+2z=7000…(2), 2×2y+z=8000….(3)

Jawaban:

x = pinsil

y = buku

z = penghapus

pers

x + 2y + z = 6500……..(1)

2x+y + 2z = 7000……..(2)

2x+2y+z = 8000……….(3)

pers 1 dan 2

x + 2y + z = 6500………×2

2x+y + 2z = 7000………×1

—————————–

2x +4y + 2z = 13.000

2x+ y + 2z = 7000

———————————(-)

3y = 6.000

y = 2.000

pers 1 dan 3

x + 2y + z = 6500…….x2

2x+2y+z = 8000……..x1

——————————–

2x + 4y + 2z = 13.000

2x + 2y + z = 8000

——————————–(-)

2y +z = 5000……………..1

2y + z = 5000

2(2000)+z =5000

z = 5000-4000

z = 1000

pers1

x + 2y + z = 6500

x +2(2000)+1000=6500

x +5000=6500

x = 6500-5000

x = 1500

jdi harga pinsil = 1500

buku = 2000

penghapus = 1000