Question

solve for the variables
2x+y-z=-2
-3x+6y-5z=5
-x+7x-z=7

Answer 1

Class?

Answer 2

college Algebra

Answer 3

ick

Answer 4

Are you guys using matrices?

Answer 5

never hear of that, so i dont think so.

Answer 6

bunch of elimination and back substitution. donkey work for machines
http://www.wolframalpha.com/input/?i=2x%2By-z%3D-2%2C+-3x%2B6y-5z%3D5+%2C-x%2B7x-z%3D7

Answer 7

OKs, check the last equation, did you make a typo. There's no y-term.

Answer 8

7y** sorry

Answer 9

If the answer is enough satellite did a good job, do you also want to see the how?

Answer 10

i didn't click on that link... should i?

Answer 11

Yes. It's the best online and general calculator on the planet earth today.

Answer 12

ohh okay, well thank youu!!

Answer 13

It will only give you the answer for this problem though, not the work.

Answer 14

well the answer i posted must be wrong because i copied and pasted

Answer 15

that is, i did not catch the typo
here is the correct one
notice i just put commas between them, the wolf did the rest'

http://www.wolframalpha.com/input/?i=2x%2By-z%3D-2%2C+-3x%2B6y-5z%3D5+%2C-x%2B7y-z%3D7

Answer 16

i also need to know if it is "no solution" "only one solution" or infinite solutions" if its "only one solution" then i need the variables, otherwise i dont.. :/

Answer 17

how do i determine that?

Answer 18

take the determinant
but if you are not using matrices, then you have to solve
that is why i would use a machine, this is very tedious

Answer 19

ohh okay