Question

how do i solve these equations using cramers rule?
https://indva.brainhoney.com/Resource/935377,0,0,0,0/Assets/flvs/educator_algebra2_v8_gs/Module4/ImagMod4/m4_12_29.gif

Answer 1

what??

Answer 2

sorry

Answer 3

I don't think you can make fractions with latex matrices like that here @helder_edwin

Answer 4

still lost...

Answer 5

\[\large x=\frac{\left|\begin{matrix}-3&7\\-1&3\end{matrix}\right|}{\left|\begin{matrix}5&7\\2&3\end{matrix}
\right|}\]

Answer 6

haha I win :)

Answer 7

sorry again.for x you have
\[ \large \left|\begin{array}{cc}
-3 & 7\\ -1 & 3
\end{array}\right| \]
over
\[ \large \begin{vmatrix}
5 & 7\\ 2 & 3
\end{vmatrix} \]

Answer 8

do you have any idea where those numbers are coming from @katiebugg ?

Answer 9

ok.... thanks i think and no

Answer 10

do you know how to find the augmented matrix of a system like\[ax+by=p\]\[cx+dy=q\]?

Answer 11

no

Answer 12

just take the coefficients from the LHS and make them into a matrix with the x coefficients in one column and the y's coefficients in the next
the first row has the first equation and the second has the second's

example:
from the form\[ax+by=p\]\[cx+dy=q\]the augmented matrix is\[A=\left[\begin{matrix}a&b\\c&d\end{matrix}\right]\]

Answer 13

let me know if you understood that or where it confuses you

Answer 14

@katiebugg please do not leave if you are still there, that would be quite rude...

Answer 15

i didnt leave lol i got it now sorry

Answer 16

cool, so do you know how to take the determinant of that matrix?

Answer 17

\[ax+by=p\]\[cx+dy=q\]the augmented matrix is\[A=\left[\begin{matrix}a&b\\c&d\end{matrix}\right]\]the determinant is written\[\det A=\left|\begin{matrix}a&b\\c&d\end{matrix}\right|=?\]do you know how to take that determinant?

Answer 18

@katiebugg it is hard to help you when you don't reply, and is rather of frustrating to those trying

Answer 19

i was taking a test sorry i understand it now i looked it upp
sorry

Answer 20

you mean you are done with this question?

Answer 21

no i skiped the lesson

Answer 22

so are we going to continue here or not?

Answer 23

u dont have too

Answer 24

ok I'll close it then