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sandal = y
keysa
2x + 3y = 270.000
taufik
3x + 4y = 390.000
nanda
4x + 5y = ?
-pake subtitusi-
harga x = 90.000
harga y = 30.000
nanda
4x + 5y
= 4(90.000) + 5(30.000)
= 360.000 + 150.000
= Rp. 510.000
jadi, harga yg harus dibayar nanda ialah Rp. 510.00p