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Linear Systemshard
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Reduce to reduced row echelon form (RREF) and solve: [1−12∣32−24∣6111∣2]\begin{bmatrix} 1 & -1 & 2 & | & 3 \\ 2 & -2 & 4 & | & 6 \\ 1 & 1 & 1 & | & 2 \end{bmatrix}​121​−1−21​241​∣∣∣​362​​

How many free variables does the solution have?