bismillah.tolong ajarkan saya harga 3 buku 4 pensil = 15.500,00 harga 5 buku 1 pensil = 26,000,00 pertanyaan : 4 buku 3 pensil adalah ... A.16.000,00 B.16.200,0

buku = x
pensil = y

3x + 4y = 15.500 | × 1
5x + y = 26.000 | × 4
___________________
3x + 4y = 15.500
20x + 4y = 104.000
________________ [ - ]
-17x = -88.500
x = -88.500 / -17
x = 5205

3x + 4y = 15.500
3(5205) + 4y = 15.500
4y = 15.500 - 15.615
4y = -115
y = -115 / 4
y = -28,75

dit =4x + 3y =
4(5205) + 3(-28,75) =
20.820 + (-115) =
20.705

#semoga membantu......