Question

Solve 2x + 3y + z = 12 using matrices.
3x + y – 4z = -5
-4x – y + 3z = 6

Answer 1

Your idea?

Answer 2

?

Answer 3

could you help me with this one too

Solve 2x – 4y + 3z = -8 using matrices.
x + 3y – 2z = 9
3x + 2y + z = 13

Answer 4

I don't do your homework, you do it. If you stuck at somewhere, I help. You MUST have something, if you don't, how can I help?

Answer 5

I came down to these four choices
I am not sure which one is correct:

(2, 2, 2)

(0, 0, 12)

(-2, -2, -2)

(-2, 5, 1)

Answer 6

for the fist quesstion:

Answer 7

is it a or b

Answer 8

$$
\Large {
2x + 3y + z = 12 \\
3x + y ~–~ 4z = -5 \\
-4x~– y + 3z = 6\\
\\~\\\iff \\~\\
\begin{bmatrix}
2 &3 & 1 \\
3&1&-4\\
-4&-1&3
\end{bmatrix}
\begin{bmatrix}
x\\ y\\ z
\end{bmatrix}
= \begin{bmatrix}
12\\ -5\\ 6
\end{bmatrix}

}$$

Answer 9

?

Answer 10

theres a few ways you can solve this, you can make an augmented matrix , or solve it by multiplying both sides by A inverse

Answer 11

I go 4 choices that I think one has to be correct

Answer 12

It's against open study policy to give out answer, but I can guide you

Answer 13

ok