As we saw in the video, solving matrix-vector equations is as simple as multiplying both sides of the equation by \(A\)'s inverse, \(A^{-1}\), should it exist. The analogy with solving linear equations like \(5x = 7\) is a good one.

If \(A^{-1}\) doesn't exist, this does not work. The equivalent analogy for linear equations would be a situation in which the coefficient in front of the \(x\) were \(0\), which is the only real number that does not have an inverse. Which of the following does **NOT** analogize in this situation?

50 XP

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