Question 384097
[A]={{{(matrix(2,2,17,4,21,5))}}}
[x]={{{(matrix(2,1,x,y))}}}
[b]={{{(matrix(2,1,76,94))}}}
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[A][x]=[b]
[x]=[A]inv[b]
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det[A]={{{17*5-21*4=1}}}
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[A]inv={{{(matrix(2,2,5,-4,-21,17))}}}
[x]=[A]inv[b]=={{{(matrix(2,2,5,-4,-21,17))*(matrix(2,1,76,94))}}}
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[x]={{{(matrix(2,1,4,2))}}}