Question

Solve the following questions by (a) Gaussian elimination method, (b) by Cramer's rule and (c) with the help of matrices. 

1.    x+y+z=9 2x+5y+7z=52 2x+y-z=0 }
Answer: x=1, y=3, z=5

2.    x+2y-z=-1 3x+8y+2z=28 4x+9y-z=14 } Answer: x=-2, y=3, z=5

3.    x+3y+2z=5 2x+y+3z=1 3x+2y+z=4 } Answer: x=29,  y=179,  z=-49

4.    x+y+z=1 2x+5y+5z=2 4x+9y+12z=3 } Answer: x=1,  y=13,  z=-13

5.    2x-y-z=6 x+3y+2z=1 3x-y-5z=1 } Answer: x=2,  y=-2,  z=2​

Answer 1

Answer:

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Step-by-step explanation:

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Answer 2

Answer:

the answer is already given how can I solve