00:01
To start, we will write the equation of matrices.
00:05
So we will have the matrix 1, negative 2, 2, just using the coefficients of the variables, then 2, 2, 2, negative 1, and then 3, negative 1, 1.
00:22
Okay, so those are just the numbers in front of the x, y, and z for the three different equations.
00:26
Then what we have is my variable matrix x, y, z, and this is equal to the constants.
00:36
So i'd have 7, 5, and 6.
00:40
Okay, so that's my matrix equation.
00:42
This is a, x, equals b.
00:45
Next, what i need to do is determine the co -fine the determinant of the matrix a...