Question

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matematika kelas 1 SMA​

Answer 1

Verified answer

Jawaban:

no 1. x = 1, y = -2, z = 5

Penjelasan dengan langkah-langkah:

1. x - y + 2z = 9

2x - 2y + 3z = 13

3x + y + z = 10

x - y + 2z = 9 | ×2

2x - 2y + 3z = 13 | ×1

2x - 2y + 4z = 18

2x - 2y + 3z = 13

______________ -

z = 5

3x + y + z = 10 | ×2

x - y + 2z = 9 | ×2

6x + 2y + 2z = 20

2x - 2y + 4z = 18

_____________ +

8x + 6z = 38

8x + 6(5) = 38

8x + 30 = 38

8x = 8

x = 1

x - y + 2z = 9 | 1 - y + 2(5) = 9

y + 11 = 9

y = -2