Question: In each case find a vector equation that is equivalent to the given system of equations. (Do not solve the equation.) (a) x1 - x2

In each case find a vector equation that is equivalent to the given system of equations. (Do not solve the equation.)
(a) x1 - x2 - x3 + x4 = 5
- x1 + x3 - 2x4 = - 3
3x1 - 4x2 + 9x3 - 2x4 = 12

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