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In questions 1-4, state whether the matrices are in echelon form, reduced row echelon form (RREF) or neither form.

$$

Echelon form RREF neither
$$
Echelon form RREF neither

$$
Echelon form RREF neither

$$
Echelon form RREF neither

Given the augmented matrix below that corresponds to a linear system in variables $$ and $$, what is the correct parametric description of the solution set?

$$ $$ $$ no solution