00:01
So in order to solve the systems of equations, we're going to put it into matrix form.
00:05
So the left -hand side is going to become an a matrix, which has all of our coefficients.
00:11
So the first row would be 25, 61, negative 12.
00:15
Second row would be 18, negative 12, 7, and the third row is 3, 4, negative 1.
00:21
That's times our x matrix, which is just our matrix of our variables, x, y, and z.
00:26
And that's going to be equal to our b matrix, which has the numbers from the right hand side.
00:32
So the first row is 21, second is 7, and the third is negative 2...