diketahui sistem persamaan linear = 3 X - 2 y = 7 2 x + y = 14.nilai 2 x ditambah 6 y =....?
Matematika
gabriella54
Pertanyaan
diketahui sistem persamaan linear = 3 X - 2 y = 7 2 x + y = 14.nilai 2 x ditambah 6 y =....?
1 Jawaban
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1. Jawaban queenmahira
3x - 2y = 7
2x + y = 14 |x2|
__________ +
3x -2y = 7
4x + 2y = 28
___________ +
7x = 35
x = 35/7
x = 5
3x -2y = 7
3(5) - 2y = 7
15 - 2y = 7
2y = 15 - 7
2y = 8
y = 8/2
y = 4
2x + 6y = 2 (5) + 6(4) = 10 + 24 = 34