Linear System Question: Solving Ax=y and Ax=z in \mathbb{R}^3"

tandoorichicken
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Suppose A is a 3x3 matrix and y is a vector in \mathbb{R}^3 such that the equation Ax=y does not have a solution. Does there exist a vector z in \mathbb{R}^3 such that the equation Ax=z has a unique solution?
 
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Thread 'Finding the nth roots of a complex number'

There are two things I don't understand about this problem. First, when finding the nth root of a number, there should in theory be n solutions. However, the formula produces n+1 roots. Here is how. The first root is simply ##\left(r\right)^{\left(\frac{1}{n}\right)}##. Then you multiply this first root by n additional expressions given by the formula, as you go through k=0,1,...n-1. So you end up with n+1 roots, which cannot be correct. Let me illustrate what I mean. For this...
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