nilai dari x + y - z

Materi : Matriks
Kelas : Xll Sma

Soal
| 2x + 6y 5 | + | 2z z + y | = | 12 4 |
| 3 3x - z | | 4y z | | 11 14 |
Maka Nilai x + y + z = ...

Penyelesaian
| 2x + 6y 5 | + | 2z z + y | = | 12 4 |
| 3 3x - z | | 4y z | | 11 14 |

Nilai y
3 + 4y = 11
4y = 11 - 3
4y = 8
y = 8/4
y = 2

Nilai z
5 + z + y = 4
5 + z + 2 = 4
5 + z = 4 - 2
5 + z = 2
z = 2 - 5
z = -3

Nilai x
3x - z + 2 = 14
3x + 3 + 2 = 14
3x + 5 = 14
3x = 14 - 5
3x = 9
x = 9/3
x = 3

Maka Nilai x + y + z = 3 + 2 + (-3) = 2