Question 381472
[A]={{{(matrix(2,2,3,-4,-2,3))}}}
[x]={{{(matrix(2,1,x,y))}}}
[b]={{{(matrix(2,1,-1,3))}}}
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[A][x]=[b]
[x]=[A]inv[b]
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det[A]=3(3)-(-2)(-4)=9-8={{{1}}}
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[A]inv={{{(matrix(2,2,3,4,2,3))}}}
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[x]={{{(matrix(2,1,9,7))}}}