Sistem Persamaan Linear Dua Variabel

MathematicsLinear EquationsMedium

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Harga 2 buku tulis dan 3 pensil adalah Rp21.000,00. Sedangkan harga 3 buku tulis dan 1 pensil adalah Rp24.500,00. Berapakah harga 1 buku tulis dan 2 pensil?

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1
Step 1

Hai, mari kita selesaikan soal cerita ini bersama-sama.

Menentukan Variabel

2
Step 2

Pertama, kita definisikan variabel. Misalkan b adalah harga satu buku tulis dan p adalah harga satu pensil.

$$b = \text{harga buku tulis}$$
$$p = \text{harga pensil}$$
3
Step 3

Berdasarkan soal, kita mendapatkan dua persamaan linear.

$$2b + 3p = 21.000$$
$$3b + p = 24.500$$
4
Step 4

Sekarang, kita gunakan metode substitusi. Kita ubah persamaan kedua untuk menyatakan p dalam b.

Langkah Penyelesaian

$$p = 24.500 - 3b$$
5
Step 5

Substitusikan persamaan ini ke dalam persamaan pertama.

$$2b + 3(24.500 - 3b) = 21.000$$
6
Step 6

Mari kita hitung distributifnya.

$$2b + 73.500 - 9b = 21.000$$
7
Step 7

Gabungkan suku-suku yang sejenis.

$$-7b + 73.500 = 21.000$$
8
Step 8

Pindahkan konstanta ke ruas kanan.

$$-7b = 21.000 - 73.500$$

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About This Question

Subject
Mathematics
Topic
Linear Equations
Difficulty
Medium
Question Type
Open Ended

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