tolong bntu donk para jenius

nomor 10 kan?
misal :
harga barang A = x
harga barang B = y

4x + 2y = 4000
10x + 4y = 9500

dieleminasi :
8x + 4y = 8000
10x + 4y = 9500
(dikurangi)
= -2x = -1500
= x = 750

disubstitusi :
= 10.750 + 4y = 9500
= 4y = 2000
= y = 500

harga barang A dan harga barang B = 750 + 500
= 1.250