A community for students.
Here's the question you clicked on:
 0 viewing
anonymous
 one year ago
Please Help! Immediately!
Use Cramer's Rule to solve this system of equations.
Write your answer as an ordered pair, like this (4, 13)
{−2x–12=4y
2y+3x=2
anonymous
 one year ago
Please Help! Immediately! Use Cramer's Rule to solve this system of equations. Write your answer as an ordered pair, like this (4, 13) {−2x–12=4y 2y+3x=2

This Question is Closed

zzr0ck3r
 one year ago
Best ResponseYou've already chosen the best response.0\[ \left[ \begin{array}{ccc} 2 & 4 \\ 3&2 \end{array} \right]\mathbf{x}= \left[ \begin{array}{ccc} 12 \\ 2 \end{array} \right]\] Where \(\textbf{x}=(x_1,x_2)\) You see how I got this?

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0No. I don't get this at all.

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0Im behind in school and i couldn't figure out that problem i tried working it out but im running out of time. I appreciate you helping. Is (12,2) the answer?

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0Could i get help with this one as well. Use Cramer's Rule to find the solution to this system of equations. Enter your answer as an ordered pair, like this: (2, 14) {5x+8y=7 3x+10y=−1

UnkleRhaukus
 one year ago
Best ResponseYou've already chosen the best response.2\[2x–12=4y\\ 2y+3x=2 \\[2ex] 2x4y=12\\ 3x+2y=2\\[2ex] \begin{bmatrix} 2&4\\3&2 \end{bmatrix} \begin{bmatrix} x\\y \end{bmatrix} = \begin{bmatrix} 12\\2 \end{bmatrix}\]

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0My answer would be (12,2)?

UnkleRhaukus
 one year ago
Best ResponseYou've already chosen the best response.2no, answer is x, and y

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0How? Im so confused. It says to put my answer in as a ordered pair.

UnkleRhaukus
 one year ago
Best ResponseYou've already chosen the best response.2we have to use Cramer's rule to find (x,y)

UnkleRhaukus
 one year ago
Best ResponseYou've already chosen the best response.2Do you know what Cramer's rule is?

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0No thats what i am confused on

UnkleRhaukus
 one year ago
Best ResponseYou've already chosen the best response.2Cramer's rule says we can find (x, y), with determinants. Do you know how to take the determinant of a matrix?

UnkleRhaukus
 one year ago
Best ResponseYou've already chosen the best response.2What is the value of this determinant? \[D = \begin{vmatrix} 2&4\\3&2\end{vmatrix}\]

UnkleRhaukus
 one year ago
Best ResponseYou've already chosen the best response.2good, that is D, the determinant of the coefficient matrix

UnkleRhaukus
 one year ago
Best ResponseYou've already chosen the best response.2Switching the first column and the solution column, we get \[D_x = \begin{vmatrix} 12&4\\2&2\end{vmatrix}\] what is the value of this determinant

UnkleRhaukus
 one year ago
Best ResponseYou've already chosen the best response.2And this one?\[D_y = \begin{vmatrix} 2&12\\3&2\end{vmatrix}\]

UnkleRhaukus
 one year ago
Best ResponseYou've already chosen the best response.2try that one again

UnkleRhaukus
 one year ago
Best ResponseYou've already chosen the best response.2ok, so we have found the values of the three determinants D = 8, D_x = 32, D_y = 40.

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0so is my answer (32,40)

UnkleRhaukus
 one year ago
Best ResponseYou've already chosen the best response.2Cramer's rule says that x = D_x / D y = D_y / D

UnkleRhaukus
 one year ago
Best ResponseYou've already chosen the best response.2hmm, sounds about right, but lets check it

UnkleRhaukus
 one year ago
Best ResponseYou've already chosen the best response.2the first equation we were given is 2x12 = 4y if (4,5) is the solution, then 2(4)12 = 4(5) is a true statement, is this right?

UnkleRhaukus
 one year ago
Best ResponseYou've already chosen the best response.2The second equation was 2y+3x = 2 if (4,5) is the solution, then 2(5)+3(4) = 2 is also true. is this also right?

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0Yes they are both right

UnkleRhaukus
 one year ago
Best ResponseYou've already chosen the best response.2Woo hoo! Then we have done it!

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0Thank you very much that helped so much.
Ask your own question
Sign UpFind more explanations on OpenStudy
Your question is ready. Sign up for free to start getting answers.
spraguer
(Moderator)
5
→ View Detailed Profile
is replying to Can someone tell me what button the professor is hitting...
23
 Teamwork 19 Teammate
 Problem Solving 19 Hero
 Engagement 19 Mad Hatter
 You have blocked this person.
 ✔ You're a fan Checking fan status...
Thanks for being so helpful in mathematics. If you are getting quality help, make sure you spread the word about OpenStudy.