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

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1. jadiemint

is this one matrices? or two

2. becca18

Just matrix. one

3. jadiemint

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

Not really. Whats the answer?

5. jadiemint

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

6. becca18

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

7. jadiemint

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

8. becca18

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

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

10. jadiemint

oooh ok thanks :D lol

11. Zarkon

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

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