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22-10-2019
Mathematics

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Does the following system of equations have a solution? If so, find one. If not, explain why not. 2x+y+z=4, x-y+3z=-2, -x+y+z=-2.

Respuesta :

22-10-2019

Answer:x=2, y=1, z=-1

Step-by-step explanation:

Given

2x+y+z=4----1

x-y+3z=-2----2

-x+y+z=-2----3

Add 2 & 3 we get

4z=-4

z=-1

Put value of z in 1 & 2

2x+y-1=4

2x+y=5----3

x-y+3(-1)=-2

x-y=1------4

add 3 & 4 we get

x=2

Put x & z in 1

y=1

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