## anonymous one year ago find the inverse of the matrix 3 -1 if it exists -10 9

1. anonymous

invese of $\begin{matrix} a & b \\ c & d \end{matrix}$ is $\begin{matrix} d & -b \\ -c & a \end{matrix}$ divided by the determinant let me see if i can write it better

2. anonymous

$\frac{1}{ad-bc}\begin{pmatrix} d & -b \\ -c & a \end{pmatrix}$

3. anonymous

that thing out front means divide by the determinant

4. anonymous

is it 9/17 1/17 ??? 10/17 3/17

5. anonymous

@satellite73

6. anonymous

hold on let me check

7. anonymous

yup

8. anonymous

not too hard, was it?