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4x + 8y = 21200
4(2500) + 8y = 21200
10000 + 8y = 21200
8y = 11200
y = 11200/8
y = 1400
jadi harga satu batang pensil = 1400 rupiah
y = pensil
4x + 8y = 21.200
4.2500 + 8y = 21.200
10.000 + 8y = 21.200
8y = 21.200 - 10.000
8y = 11.200
y = 11.200/8 = 1400