
Quiz SPLDV
Authored by annisa annisa
Mathematics
8th Grade
Used 2+ times

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5 questions
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1.
MULTIPLE CHOICE QUESTION
10 sec • 20 pts
Manakah di antara persamaan berikut yang merupakan persamaan linear dua variabel ?
2 + 12p = 8
4p + 2 = 8
3q = 4 - 2p
n = 4n – 6
Answer explanation
3q = 4 - 2p
2.
MULTIPLE CHOICE QUESTION
20 sec • 20 pts
Apakah persamaan 4x – 3y = 5 dan 7y + 2x = -8 membentuk sistem persamaan linear dua variabel?
Answer explanation
True
3.
MULTIPLE CHOICE QUESTION
1 min • 20 pts
3, 3
4, 4
-3, -3
-4, -4
Answer explanation
penyelesaian:
y - x = 0 → y = x
2x - 5y = 9
⇒ 2x - 5(x) = 9
⇒ -3x = 9
⇒ x = -3
disubstitusikan ke :
y - x = 0
⇒ y - (-3) = 0
⇒ y + 3 = 0
⇒ y = -3
jadi, selesaiannya adalah (-3, -3)
4.
MULTIPLE CHOICE QUESTION
30 sec • 20 pts
Grafik tersebut menunjukkan sistem persamaan linear dua variabel. Berapa banyak selesaian yang dimiliki oleh sistem persamaan tersebut?
tidak punya
tepat satu
tepat dua
tak hingga
Answer explanation
Karena dua garis sejajar dan tidak memiliki titik potong.
5.
MULTIPLE CHOICE QUESTION
3 mins • 20 pts
Rp32.000,00
Rp34.000,00
Rp36.000,00
Rp38.000,00
Answer explanation
Penyelesaian:
Misal harga 1 buku x rupiah dan harga 1 penggaris y rupiah, maka model matematikanya sebagai berikut.
5 buku dan 3 penggaris = Rp21.000,00 ⇒ 5x + 3y = 21000 ...(x2)
4 buku dan 2 penggaris = Rp16.000,00 ⇒ 4x + 2y = 16000 ...(x3)
10x + 6y = 42000
12x + 6y = 48000 -
-2x = -6000
⇔ x = 3000
x = 3000 → 4x + 2y = 16000
⇔ 4(3000) + 2y = 16000
⇔ 12000 + 2y = 16000
⇔ 2y = 16000 – 12000
⇔ 2y = 4000
⇔ y = 2000
Harga 1 buku Rp3.000,00 dan harga 1 penggaris Rp2.000,00
Harga 10 buku dan 3 penggaris:
10 x Rp3.000,00 + 3 x Rp2.000,00 = Rp36.000,00
Jadi, uang yang harus dibayar untuk 10 buku dan 2 penggaris sebesar: Rp36.000,00.
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