Let us find the rank of the extended matrix of the system of equations:
⎝⎛112−1101−2−1∣∣123⎠⎞−I−2I∼⎝⎛100−1221−3−3∣∣111⎠⎞−II∼⎝⎛100−1201−30∣∣110⎠⎞
Since the ranks of the main and extended matrix are equal to each other, but not equal to the number of equations:
rank(A)=rank(A∣B)=2=3 , the system of equations is consistent, but not defined, and therefore has an infinite number of solutions
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