# Thread: Matrices and confusion! :/

1. ## Matrices and confusion! :/

Solve x + 10y – 2z = 20
5x – 3y + 4z = 82x + y = 6

 (20, 8, 6) (4, -2, 5) (2, 2, 1) (2, 4, -1)

2. ## Re: Matrices and confusion! :/

Sorry, it didn't paste right.
Here is the correct problem:
x + 10y – 2z = 20
5x – 3y + 4z = 8
2x + y = 6

3. ## Re: Matrices and confusion! :/

Originally Posted by dzomberg
Sorry, it didn't paste right.
Here is the correct problem:
x + 10y – 2z = 20
5x – 3y + 4z = 8
2x + y = 6
Can you use an inverse matrix to solve
$\left[ {\begin{array}{rrr}1&{10}&{ - 2}\\5&{ - 3}&4\\2&1&0\end{array}} \right]\left[ {\begin{array}{*{20}{c}}x\\y\\z\end{array}} \right] = \left[ {\begin{array}{*{20}{c}}{20}\\8\\6\end{array}} \right]$