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January 30, 2015

January 30, 2015

Posted by **Kris** on Thursday, March 21, 2013 at 9:13am.

I have some practice math I'm working through and I'm unsure about the answer. I will also put what I got. Thanks for the help.

1. Solve using any method and identify the system as consistent, inconsistent, or dependent.

-2x+y=8

2x+2y=-8

A.) (-4,0); consistent/independent

B.) (-4,0); consistent/dependent

C.) {(-4,0 | -2x+y=8} ; consistent/dependent

D.) zero with a line through it;consistent

I thought C for this one.

2.) Solve the system using the elimination method. If the system is inconsistent or dependent, so state.

x-2y+5z=1

-x-2y+3z=-5

2x-4y+10z=3

A) (5,-3,-2)

B) (5,-4,-1)

C) dependent

D) no solution, inconsistent

I got C for this one.

3.) Solve using any method and identify the system as consistent, inconsistent, or dependent.

0.2y=0.4x+0

0.8x-0.4y=5

A.) zero with a line through it; inconsistent

B) zero with a line through it; consistent

C) zero with a line through it; dependent

D) Determination is not possible with the given information

I got A for this.

- Algebra-Multiple choice -
**Knights**, Thursday, March 21, 2013 at 9:24am1. Should be C (IF not, then B)

2. D, if you multiply 1st equation by 2, try subtracting the third equation, and you get 0 = 5 or 0 = -1

3.

2y = 4x

8x-4y=5

-4y = 5-8x

4y = 8x-5

2y = 4x - 5/2

When minus the first equation from this, we get 0 = -5/2

So, A.

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