I will give you 2 nice youtubes to show how this is done
https://www.youtube.com/watch?v=taBHTo8sviM
She sets it up nicely, but does not actually show how to find the determinant of a 3by3.
This one shows a nice short-cut method to find the determinant, but I must point out that this only works for 3by3 matrix
https://www.youtube.com/watch?v=ROFcVgehEYA
If possible, solve the following linear systems by Cramer's rule.
2x1 + 4x2 + 6x3 = 14
x1 + 2x3 = 0
2x1 + 3x2 − x3 = 30
1 answer