Matematika

Pertanyaan

mohon dijawab ya pertanyaan
mohon dijawab ya pertanyaan

1 Jawaban

  • Kelas 8 Matematika
    Bab SPLDV

    Buku tulis = a
    Pensil = b

    8a + 6b = 14.000 → dikali 3 → 24a + 18b = 42.000
    6a + 5b = 11.200 → dikali 4 → 24a + 20b = 44.800

    24a + 18b = 42.000
    24a + 20b = 44.800
    ------------------------------- -
    -2b = -2.800
    b = -2.800/-2
    b = 1.400

    8a + 6b = 14.000
    8a + 6 . 1.400 = 14.000
    8a = 14.000 - 8.400
    a = 5.600/8
    a = 700

    Harga 5 buku tulis
    5 . a = 5 . 700
    5a = Rp 3.500,00