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anonymous
 4 years ago
Use Cramer's rule to solve the system of equations.
{ 2x+3y=4
x2y=9
anonymous
 4 years ago
Use Cramer's rule to solve the system of equations. { 2x+3y=4 x2y=9

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anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0Are you studying matrices / linear algebra?

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0Great, so how far have you got until now?

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0(If you're stuck from the beginning, that's fine too though!)

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0i understand how to do it, just the last step is where i mess up. I only know how to put them into the matrix sets, and solve those out. but i have no idea where to go from there.

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0As I remember it, you create a square matrix A (left hand side of the equation) and column (that's vertical) vector b (right side of the equation). To get x, you replace the first column of your square matrix with vector b, whereas for y you replace the second column of your square matrix with vector b instead. In both cases, you then take the determinant of the new matrix you've created, and divide by the determinant of the original square matrix A. Does that make sense?

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0If so, we can try it with the numbers now?

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0If that doesn't make sense, we can do it using Draw.

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0\[\left[\begin{matrix}2 & 3 \\ 1 & 2\end{matrix}\right]\left(\begin{matrix}x \\ y\end{matrix}\right)=\left(\begin{matrix}4 \\ 9\end{matrix}\right)\]

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0I'm still working on it. I'm not goot at using this editor

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0So the original square matrix is the one that iven5880 has laid out, and whose determinant is 2*2 3*1 = 43=7.

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0dw:1327953451141:dw

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0arricuhh, does that part make sense to you?

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0Can you do the same thing for y?

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0can you help me with me it /:

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0OK, how are you going to start?

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0dw:1327953694308:dw

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0oh, welll.. thank you iven5880! and thank you BasketWeave

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0You're welcome! Mostly thanks to iven5880 though, I'd say :D

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0You're welcome and thanks BasketWeave
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