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penghapus = y
3 x + 2y = 10.500
3×4 y + 2 y = 10.500
12 y + 2 y = 10.500
14 y =10.500
y =10.500 : 14
y=750
jadi, harga 1 x + 4 y = 1×4y + 4y = 4y + 4y= 8y=8×750=6.000 (c)