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buku = b
2p + 3b = 2.300
3p + 2b = 2.200
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6p + 9b = 6.900 [x3]
6p + 4b = 4.400 [x2] -
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5b = 2500
b = 2500÷ 5
b= 500
substitusikan
2p + 3(500) = 2.300
2p + 1500 = 2300
2p = 2300-1500
2p= 800
p= 800÷2
p= 400
buku = y
( 2x + 3y = 2.300 ).3
( 3x + 2y = 2.200 ).2
=> (6x + 9y = 6.900) - (6x + 4y = 4.400) => 5y = 2.500 => y = 500
( 2x + 3y = 2.300 ).2
( 3x + 2y = 2.200 ).3
=> (4x + 6y = 4.600) - (9x + 6y = 6.600)=> -5x =-2000 => x = 400
jadi, harga 1 pensil = Rp.400,00 dan harga 1 buku = Rp.500,00
maaf kalau salah