karenscholar
karenscholar karenscholar
  • 10-09-2019
  • Mathematics
contestada

Can someone please show me step by step for this system of equations? (Number 5)

Can someone please show me step by step for this system of equations Number 5 class=

Respuesta :

cosmicctrl
cosmicctrl cosmicctrl
  • 10-09-2019

Answer:

x = 3, y = -1, z = -4

Step-by-step explanation:

2x + y - z = 9 (1)

- x + 6y + 2z = -17 (2)

5x + 7y + z = 4 (3)

(3) + (1)

7x + 8y = 13 (4)

2 × (1)

4x + 2y - 2z = 18 (5)

(5) + (2)

3x + 8y = 1 (6)

(4) - (6)

4x =12

x = 3

substitute x = 3 in (6)

9 + 8y = 1

8y = -8

y = -1

substitute x = 3 and y = -1 in (1)

2 × 3 + (-1) - z = 9

6 - 1 - z = 9

5 - z = 9

z = 5 - 9

z = -4

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