Question 999381
Use Cramer's rule,
{{{A=(matrix(4,4,
1,1,1,1,
2,-1,-1,2,
2,3,2,-1,
3,-2,-1,3))}}}
{{{abs(A)=-9 }}}
.
.
.
{{{A[w]=(matrix(4,4,
2,1,1,1,
7,-1,-1,2,
-2,3,2,-1,
-2,-2,-1,3))}}}
{{{abs(A[w])=27 }}}
.
.
.
{{{A[x]=(matrix(4,4,
1,2,1,1,
2,7,-1,2,
2,-2,2,-1,
3,-2,-1,3))}}}
{{{abs(A[x])=-108 }}}
.
.
.
{{{A[y]=(matrix(4,4,
1,1,2,1,
2,-1,7,2,
2,3,-2,-1,
3,-2,-2,3))}}}
{{{abs(A[y])=117 }}}
.
.
.
{{{A[z]=(matrix(4,4,
1,1,1,2,
2,-1,-1,7,
2,3,2,-2,
3,-2,-1,-2))}}}
{{{abs(A[z])=-54 }}}
.
.
.
{{{w=abs(A[w])/abs(A)=27/(-9)=-3}}}
.
{{{x=abs(A[x])/abs(A)=(-108)/(-9)=12}}}
.
{{{y=abs(A[y])/abs(A)=117/(-9)=13}}}
.
{{{z=abs(A[z])/abs(A)=(-54)/(-9)=6}}}