Question 324812
I think this is what you mean.
{{{(matrix(2,2,-4,5,-2,-4))(matrix(2,1,x1,x2)) +(matrix(2,1,3,18))=(matrix(2,1,71,0))}}}
Simplify,
{{{(matrix(2,2,-4,5,-2,-4))(matrix(2,1,x1,x2))=(matrix(2,1,68,-18))}}}
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[A][x]=[b]
[A]inv[A][x]=[A]inv[b]
[x]=[A]inv[b]
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[A]={{{(matrix(2,2,-4,5,-2,-4))}}}
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Find the inverse of the coefficient matrix [A],
det([A])={{{26}}}
[A]inv={{{(1/26)*(matrix(2,2,-4,-5,2,-4))}}}
[x]={{{(1/26)*(matrix(2,1,23,-44))}}}
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{{{x1=23/26}}}
{{{x2=-44/26=-22/13}}}