Question: code class=asciimath>(4) Let A=([1,2,-1],[3,1,1],[2,-1,2])(a) Is A invertible? (b) If A([x],[y],[z])=([a],[b],[c]) has a solution, how are the elements a,b,c related? How does this result compare with

code class="asciimath">(4) Let A=([1,2,-1],[3,1,1],[2,-1,2])(a) Is A invertible? (b) If A([x],[y],[z])=([a],[b],[c]) has a solution, how are the elements a,b,c related? How does this result compare with (3b)?

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