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07-10-2019
Mathematics

contestada

3x + y - z= -6
2x - y + 2z = 8
4x + y - 3z = -21

Respuesta :

1183076653 1183076653

07-10-2019

Answer:

x=-1

y=4

z=7

Step-by-step explanation:

3x + y - z= -6(1)

2x - y + 2z = 8(2)

4x + y - 3z = -21(3)

(1)+(2): 5x+z=2(4)

(2)+(3): 6x-z=-13(5)

(4)+(5): 11x=-11

x=-1

so z=2-5x=7

y=-6-3x+z=4

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