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Part $1$

Let Aequalsleft bracket Start $3$ By $3$ Matrix $1$st Row $1$st Column $12$nd Column negative $23$rd Column negative $12$nd Row $1$st Column negative $42$nd Column $43$rd Column $03$rd Row $1$st Column $42$nd Column $03$rd Column $4$ EndMatrix right bracket

and bequalsleft bracket Start $3$ By $1$ Matrix $1$st Row $1$st Column b $12$nd Row $1$st Column b $23$rd Row $1$st Column b $3$ EndMatrix right bracket

$.$ Show that the equation Axequalsb does not have a solution for all possible b$,$ and describe the set of all b for which Axequalsb does have a solution.