00:01
We want to solve the system 4y plus 3z equals negative 2, 5x minus 4y equals 1, and negative 5x plus 4y plus z equals negative 3.
00:15
We want to create a matrix equation with the first matrix is the coefficient matrix with the coefficients 0x, 4y, 3z.
00:23
Then you have 5, negative 4, 0, negative 5, 4, 1 times the variables x, y, and z equals the constants, negative, 2, 1, and negative 3.
00:34
Call the coefficient matrix a, the constant matrix b, and you can simultaneously solve for x, y, and z if you find the inverse of matrix a and then multiply it by matrix b.
00:48
So with the calculator, you've got your 3x3 -3 -1 -3 -1 matrix, elements 1 -4 -3, 5 -4 -0, negative -4 -1.
01:00
Store that.
01:02
Matrix b is a 3 -by -1 matrix, negative 2, 1, 1 ,000...