Question

Help please??? I don't remember how to do this.
Solve x + y + z = 12
2x – y – z = -6
x + 3y + 5z = 44



(4, 3, 5)


no solutions


(2, 4, -6)


(2, 4, 6)

Answer 1

HI!!

Answer 2

the bottem one.

Answer 3

there are a couple methods for doing this, all boring donkey work
let the machine do it

Answer 4

(2,4,6)

Answer 5

I would do sub for the first variable.
Matrix is also a way

Answer 6

http://www.wolframalpha.com/input/?i=+x+%2B+y+%2B+z+%3D+12%2C++2x+%E2%80%93+y+%E2%80%93+z+%3D+-6+%2Cx+%2B+3y+%2B+5z+%3D+44

Answer 7

add the top row with the middle row.

Answer 8

let the robot/comp tie your laces for you-:(