jika x dan y memenuhi system persamaan 5×-3y=20 dan 3×-5y=-4,maka nilai 6×-4y adalah...
Matematika
PutriSaharaAshyita
Pertanyaan
jika x dan y memenuhi system persamaan 5×-3y=20 dan 3×-5y=-4,maka nilai 6×-4y adalah...
1 Jawaban
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1. Jawaban wilsonrubik123
5x - 3y = 20| kali 3
3x - 5y = -4 | kali 5
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15x - 9y = 60
15x - 25y = -20
_____________ [ - ]
16y = 80
y = 80 / 16
y = 5
5x - 3y = 20
5x - 3(5) = 20
5x - 15 = 20
5x = 20 + 15
x = 35 / 5
x = 7
Jadi, nilai 6x - 4y =
6x - 4y =
6(7) - 4(5) =
42 - 20 =
22
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