With the help of matrices , the solution of the equations
x=1, y=2,z=-1
x=-1,y=2,z=1
x=6,y=-2,z=-1
x=-1,y=-2,z=1
As learnt in
Cramer's rule for solving system of linear equations -
When and ,
then the system of equations has infinite solutions.
- wherein
and
are obtained by replacing column 1,2,3 of by column
We should solve such questions analytically by cross-checking options because of the time constraint.
, satisfy all these equations
Option 1)
x=1, y=2,z=-1
This option is correct.
Option 2)
x=-1,y=2,z=1
This option is incorrect.
Option 3)
x=6,y=-2,z=-1
This option is incorrect.
Option 4)
x=-1,y=-2,z=1
This option is incorrect.