What is the solution of the system? Solve using matrices.
x+2y = -1
-x - 3y = -2

Question

What is the solution of the system? Solve using matrices.
x+2y = -1 
-x - 3y = -2

anonymous · Answer

{1 2 -1]
[-1 -3 -2]

anonymous · Answer

did you type that out right?

anonymous · Answer

the answer choices are: [-7,3], [3,-7], [7,-3], and 'no solution'.

anonymous · Answer

pretty sure its no solution .

anonymous · Answer

plugging in those values won't work.

anonymous · Answer

okay. thank you very much.

anonymous · Answer

wait wait

anonymous · Answer

-7 3 does.

anonymous · Answer

-7 + 2(3) = -1  and 7 -3(3) = -2/

anonymous · Answer

I just checked it myself. It's [-7,3], yes?

anonymous · Answer

[-7 3] yes, I'm sorry. apparently I'm off tonight.

anonymous · Answer

it's fine. can you help me with another?

anonymous · Answer

sure

anonymous · Answer

Solve the system:
3x+y-4z= -30
3x+2y+2z= -8
5x+5y+z= -26

anonymous · Answer

the answers are: (-30,-8,-26)
(4,-2,4)
(-4,-2,4)
and 
(-4,2,-4)

anonymous · Answer

the proper way to do these is to isolate and use smaller equations, but with them giving you answer choices you can just plug and check. so how about we both do it and you tell me what you get.

anonymous · Answer

okay then.

anonymous · Answer

are you going to be actually tested on these and do you want to learn how to properly do them without the answers?

anonymous · Answer

It's -4,-2, and 4.

anonymous · Answer

yeah thats what I got as well.