Posted by **Becca** on Thursday, March 28, 2013 at 10:31am.

I have a few questions I need help with! Please explain if my answer was not right how you got to it. I got 1.) B 2.) A 3.) C

1. Solve the system by triangularizing the augmented matrix and using back substitution. If the system is linearly dependent, give the solution in terms of a parameter.

-3x+y-z=-4

6x-2y+2z=8

-12x+4y-4z=-16

A.)(1,1,2)

B.)(0, -2)

C.) (0,-3)

D.) (-1,-2)

2. Solve the system by triangularizing the augmented matrix and using back substitution.

6x=y-4

3y=-13-7x

a.) (-1,-3)

b.) (0,-2)

C.) (0,-3)

D.) (-1,-2)

3. What row operation would produce zero beneath the first entry in the diagonal?

1 2 | -1

8 -2 | -2

A.) 8R1-R2--> R2

B.) -8R1-R2 -->R2

C.) -R1+R2 --> R2

D.) 8R1-R2 --> R2

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