Question

Solve the following system of equations.

x + 4y + z = –10
3x – 3y + 6z = –21
x + 2y + 2z = –10

(1, –2, –3)

(–4, –1, –2)

(–3, –2, –3)

(2, –2, –4)

Answer 1

do you want to know how I would do this if given those choices or do you want to know how to do this without those choices?

Answer 2

w/o

Answer 3

on a multiple choice exam/quiz i'd just plug away at those choices to see which one fits all three equations.... because of time constraints.

Answer 4

ok. you know elimination?

Answer 5

yes

Answer 6

looking at the system, it looks like it'd be easier if we eliminate the x-variable... so take equation 1 and equation 2 and eliminate the x variable.

Answer 7

i'll do it too...

Answer 8

okay