**EXPERT ANSWER**

# 4. -12 points HoltLinAlg2 1.1.018 Determine if the given linear system is in echelon form. -9×3–9 -x2-4×3-11 o echelon form O not in echelon form If so, identify the leading variables and the free variables. (Select all that apply.) Leading variables: x2 x3 no leading variables not in echelon form Free variables: X3 no free variables not in echelon form If not, explain why not. The linear system is not in echelon form since the leading variable x3 in equation 2 lies to the right of the leading variable x2 in equation 3 The linear system is not in echelon form since x3 is the leading variable in all the equations The linear system is not in echelon form since there are no free variables O The linear system is not in echelon form since there are no leading variables O The linear system is in echelon form.

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