Question

Use the matrix method to solve the system of equations 2x + 4y = 8 and 6x + 3y = -3. The resulting matrix is:

1 0 -2
0 1 3



1 0 2
0 1 3






0 1 -2
1 0 3

Answer 1

The calculator function that puts the augmented matrix

`\left[\begin{array}c2&4&8\\6&3&-3\end{array}\right]`

into reduced row-echelon form will give you an identity matrix in the left columns and the solution in the rightmost column:

`\left[\begin{array}{ccc}1&0&-2\\0&1&3\end{array}\right]`

This corresponds to the first selection.