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pensil = y
x=3y
x-3y = 0
4x+3y=24000
x - 3y= 0 + ---->>metode eliminasi
5x = 24000
x = 24000 : 5 = 4800
metode substitusi
x = 3y
4800 = 3y
y = 4800 : 3 = 1600
3 buku dan 1 pensil = 3x + y = 3(4800) + 1600 = 14400 + 1600 = Rp 30.400,00