Question

Need some help with these final two problems? Please?

Answer 1

What linear system of equations does the matrix represent?

Answer 2

@JoelSjogren

Answer 3

I don't think any of those is correct.
\[
\begin{cases}4x-7y=-12\\-14x+4y=4\end{cases}
\]

Answer 4

Oh sorry, since some of them look alike I guess I posted them twice...but the one you typed is an option....THANK YOU!
Last one?

Answer 5

Last one?

Answer 6

\[\begin{cases}2x+5y=-4\\4x-5y=22\end{cases}\]
Multiply the first equation so that the coefficients of x are the same, i.e. by 2.
\[\begin{cases}4x+10y=-8\\4x-5y=22\end{cases}\]
Subtract the second equation from the first
\[(4x+10y)-(4x-5y)=(-8)-(22) \\ 15y = -30 \\ y = -2\]
We have now extracted enough information to answer.

Answer 7

So it would be A?

Answer 8

Thank You

Answer 9

You're welcome!