Jawaban:
a. Rp9.000
Penjelasan dengan langkah-langkah:
Misalkan
Buku tulis = x
pulpen = y
5x + 3y = 20.500 |×4|
2x + 4y = 11.000 |×3|
20x + 12y = 82.000
6x + 12y = 33.000
_______________-
14x = 49.000
x = 49.000/14
x = Rp3.500
2x + 4y = 11.000
2(3.500) + 4y = 11.000
7.000 + 4y = 11.000
4y = 11.000 - 7.000
4y = 4.000
y = 4.000/4
y = Rp1.000
2x + 2y
= 2(3.500) + 2(1.000)
= Rp7.000 + Rp2.000
= Rp9.000 (A).
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Jawaban:
a. Rp9.000
Penjelasan dengan langkah-langkah:
Misalkan
Buku tulis = x
pulpen = y
5x + 3y = 20.500 |×4|
2x + 4y = 11.000 |×3|
20x + 12y = 82.000
6x + 12y = 33.000
_______________-
14x = 49.000
x = 49.000/14
x = Rp3.500
2x + 4y = 11.000
2(3.500) + 4y = 11.000
7.000 + 4y = 11.000
4y = 11.000 - 7.000
4y = 4.000
y = 4.000/4
y = Rp1.000
2x + 2y
= 2(3.500) + 2(1.000)
= Rp7.000 + Rp2.000
= Rp9.000 (A).