Question 857750
{{{(matrix(3,3,1,1,1,1,2,3,3,1,4))*(matrix(3,1,x,y,z))=(matrix(3,1,5,11,13))}}}
{{{(matrix(3,1,x,y,z))=(1/5)(matrix(3,3,5,-3,1,5,1,-2,-5,2,1))*(matrix(3,1,5,11,13))}}}
{{{(matrix(3,1,x,y,z))=(matrix(3,1,1,1,1))}}}