## becca18 Group Title Find the determinant of the following: |3 -3| |-1 2| 2 years ago 2 years ago

is this one matrices? or two

2. becca18 Group Title

Just matrix. one

ok. then the determinent is 1/(ad-bc), where a is top left, b is top right, c is bottom left and d is bottom right. that help?

4. becca18 Group Title

I got 1/3. is that what you got?

6. becca18 Group Title

No this is what I got, |dw:1320713982160:dw| And I just looked at my notes and its not matrix I don't think.

Oh, you're right, sorry my mistake :) I was going one step further towards finding the inverse lol your answer's right!

8. becca18 Group Title

I'm confused because we learned how to do it this way last week but now we're doing Matrix and it looks the same and the direstions don't tell me anything

9. becca18 Group Title

Thank You! Btw I think it's Called Cramers rule(:

Cramer's rule is a way to use determinants to solve some systems of equations. if $A=\left[\begin{matrix}a & b \\ c & d\end{matrix}\right]$ then $|A|=ad-bc$ always