`-x + y = 4, 2x - 4y = -34` Use matricies to solve the system of equations. Use Gaussian elimination with back-substitution.

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Write the system of equations as an augmented matrix.


Multiply the first line by a 2.

`[[-2,2|8],[2,-4|-34]] `

Eliminate the first column.










The solution set is (9, 13).


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