00:01
So to solve this expression using the inverse of our matrix, we're first going to want to express this matrix, or this system of equations in matrix form.
00:14
So it's going to be a, which will be our matrix of coefficients, times our matrix with the variables x, is equal to our b matrix, which will have the 8 and the 5 in it.
00:33
So we're solving for our variables x.
00:36
So in order to do that, we're going to want to express this equation in x equals.
00:41
In order to do that, we are going to multiply both sides by the inverse of a, which we solved in a previous problem.
00:50
I included it in the upper right -hand corner.
00:57
A inverse times a will just give us the identity matrix.
01:01
So this will essentially cancel out, and then we'll be left with x equals our inverse a matrix times b.
01:19
Now looking at what would go into our a and our x matrix, it's coming from the left -hand side of our system of equations.
01:31
So our a matrix would be filled with the coefficients.
01:34
It would be 2, 1, 1, 1, and 1...