Question: Not Enough Variables: A linear system Ax = b with fewer unknowns than equations can have infinitely many solutions, no solutions, or a unique solution.

Not Enough Variables: A linear system Ax̅ = b̅ with fewer unknowns than equations can have infinitely many solutions, no solutions, or a unique solution. Construct the RREFs for the augmented matrices [A I b̅] that illustrate the three possible cases for a system of four equations in two unknowns?

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