Question

Solve the following system of equations.

4x - 3y + z = -9
x + 2y + 2z = 5
x - 2y + 3z = -2

Answer 1

do you have an idea where to start?

Answer 2

I have two ways to solve them? elimination or substitution? and graphing? @soccergurl7991

Answer 3

i would use substitution since there are already a lot of variables without coefficients

Answer 4

can you walk me though it? I have a lot of problems with it!;/

Answer 5

okey dokey. lemme work it out before i try to tell you something that may be wrong; in the meantime, do you have answer choices? and try solving for x in each of the last two equations

Answer 6

(1, 1, -10)
(1, 2, -7)
(-1, 2, 1)
(-1, 1, 0)

Answer 7

okay i got it!
have you made progress?

Answer 8

not really, ive got a lot more questions and im working on them too!:/

Answer 9

okay i hear you. im scanning the paper i worked out out on and then i can walk you through all the work i did :)

Answer 10

thank you so much!

Answer 11

absolutely, happy to help!

Answer 12

:)

Answer 13

this is my work

Answer 14

I suggest elimination. AKA manipulating each equation to cancel out variables you don't want.

Answer 15

THANKS SO SO SO SO MUCH!

Answer 16

@ninashabrang, the first thing i did was write out each equation on top of each other and then i saw that in the bottom two equations, x didn't have a coefficient so i did as @marissalovescats said, just eliminated x from the bottom equation, leaving me with 4y-z=7
follow me so far?

Answer 17

@ninashabrang, i want to make sure you know how to do this and are not just going straight for the answer...

Answer 18

yeah thanks im reading over it and rewriting t and explaining it to myself! hanks for showing all of your work!

Answer 19

your welcome! i tried to make it as easy to read as possible, but i tend to write in whatever space is available so it may be hard to follow the train of thought. im here if you have a question on what came first or whatever, so don't hesitate to ask! :)