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6× + 2000 = 6500
6× = 6500 - 2000 = 4500
× = 750
substitusi :
buku = 750 + 500 = 1250 / buah
penggaris = 750 / buah
penggaris diumpamakan y
4x + 2y = 6.500
x = y + 500
Maka,
4x + 2y = 6.500
4(y+500) + 2y = 6.500
4y + 2.000 + 2y = 6.500
6y + 2.000 = 6.500
6y = 6.500 - 2.000
6y = 4.500
y =
y = 750
x = y + 500
x = 750 + 500
x = 1.250
x + 2y
= 1.250 + 2x750
= 1.250 + 1.500
= 3.750
Jadi, harga sebuah buku dan 2 penggaris adalah Rp3.750