Question

cramer's Rule 3 x3
' -1 1 1 '
' -9 5 3 '
' 5 -2 -1 '
' '
the key is -2, but my answer is 0,thank you in advance

Answer 1

The answer is -2.
The equation to solve is:
-1(-5+6)-1(9-15)+1(18-25)

Answer 2

[5 3] [-9 3] [-9 5]
+ (-1) [-2 -1] - (1)[5 -1] +(1)[5 -2]

=-1(-5+6)-1(9-15)+1(18-25)
= -1(1) -1(-6) +1(-7)
=-2 ans