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misal x=buku, y=pensil
5x+8y=24.500
3x+5y=15000
eliminasi
5x+8y= 24.500 |dikali 3
3x+5y=15000. |dikali 5
jadi
15x+24y=73.500
15x+25y= 75000
dikurang semua jd y= 1500
subs 3x+5y= 15000
3x+7500=15000
3x= 7500
x= 2500
JD 7x+5y=
7(2500)+5(1500)
=17500+7500
= 25000
5x + 8y = 24500 (pers.1)
3x + 5y = 15000 (pers.2)
mengeliminasi x pada pers. 1&2
5x + 8y = 24500 |x3| 15x + 24y = 73500
3x + 5y = 15000 |x5| 15x + 25y = 75000
= -y = - 1500
= y = 1500
substitusi y = 1500 ke pers. 1
5x + 8.1500 = 24500
5x + 12000 = 24500
5x = 24500 - 12000
5x = 12500
x = 12500/5 = 2500
7x + 5y = 7.2500 + 5.1500
= 17500 + 7500
= 25000
jadi nayla harus membayar Rp 25.000