Question 1027575
Use Cramer's rule,
{{{A=(matrix(4,4,
1,-3,-3,2,
4,0,2,-6,
2,6,-1,4,
3,6,2,1
))
{{{abs(A)=-258}}}
.
.
.
{{{A[a]=(matrix(4,4,
-14,-3,-3,2,
-10,0,2,-6,
-4,6,-1,4,
2,6,2,1
))
{{{abs(A[a])=774}}}
.
.
.
{{{A[b]=(matrix(4,4,
1,-14,-3,2,
4,-10,2,-6,
2,-4,-1,4,
3,2,2,1
))
{{{abs(A[b])=-86}}}
.
.
.
{{{A[c]=(matrix(4,4,
1,-3,-14,2,
4,0,-10,-6,
2,6,-4,4,
3,6,2,1
))
{{{abs(A[c])=-1032}}}
.
.
.
{{{A[d]=(matrix(4,4,
1,-3,-3,-14,
4,0,2,-10,
2,6,-1,-4,
3,6,2,2
))
{{{abs(A[d])=-258}}}
.
.
.
{{{a=abs(A[a])/abs(A)=(774)/(-258)=-3}}}
{{{b=abs(A[b])/abs(A)=(-86)/(-258)=1/3}}}
{{{c=abs(A[c])/abs(A)=(-1032)/(-258)=4}}}
{{{d=abs(A[d])/abs(A)=(-258)/(-258)=1}}}