Tolong yah ini perlu banget Gambar no 10,13,12,14,15,19,21,22,37 belum ada nanti saya kirim

No. 6

diket:
harga 6 pensil + 7 pulpen = Rp 11.750
harga 4 pensil + 3 pensil = Rp 5.750
Ditanya harga 1 pensil = ?

> misal:
pensil = x
pulpen = y

jadi;
6x + 7y = Rp 11.750
4x + 3y = Rp 5.750

Eliminasi
6x + 7y = Rp 11.750 | ×2
4x + 3y = Rp 5.750 | ×3
maka;
12x + 14y = Rp 23.500
12x + 9y = Rp 17.250 (dikurangkan)
____________________ _
5y = Rp 6.250
y = Rp 6.250 ÷ 5
y = Rp 1.250 (harga 1 pulpen)

Substitusi
4x + 3y = Rp 5.750
4x + (3 × Rp 1.250) = Rp 5.750
4x + Rp 3.750 = Rp 5.750
4x = Rp 5.750 - Rp 3.750
4x = Rp 2000
x = Rp 500 (harga 1 pensil)

Jadi, harga 1 pensil = Rp 500,00