Hello, Lane,Originally Posted by Lane
use Cramer's rule:
. So it's answer C.
Hello, LaneOriginally Posted by Lane
(I assume that there is a typo in the first row)
Calculate: R2-2*R1 and R3-R1. You'll get:
Now calculate R3+4*R2:
So you get z = -1. Now re-substitute this value into equation 2 and afterward plug in the values for y and z into the first equation. You should get: [4, -5, -1]
The augmented matrix is equivalent to the system of equations:
Now check the candidate solutions to see which satisfy these equations.
The first equation is satisfied by those candidate solutions with , and the second by those candidates with , so it looks like (C) is the required answer.