Question

Use a matrix to solve the system: 3x + 2y – z = 17 x - 2y - 4z = 5 2x + y + 2z = 5

Answer 1

Hello

Answer un excel file

$\left[\begin{array}{ccc}3&2&-1\\1&-2&-4\\2&1&2\end{array}\right] *\left[\begin{array}{c}x\\y\\z\end{array}\right] =\left[\begin{array}{c}17\\5\\5\\\end{array}\right]$

Gaussian 's method

x=3

y=3

z=-2

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