A community for students.
Here's the question you clicked on:
 0 viewing
alyssababy7
 3 years ago
Use Cramer's rule to solve the system. 2x + 4y  z = 32 x  2y + 2z = 5 5x + y + z = 20
A. {( 1, 9, 6)}
B. {( 2, 7, 6)}
C. {( 9, 6, 9)}
D. {( 1, 9, 6)}
alyssababy7
 3 years ago
Use Cramer's rule to solve the system. 2x + 4y  z = 32 x  2y + 2z = 5 5x + y + z = 20 A. {( 1, 9, 6)} B. {( 2, 7, 6)} C. {( 9, 6, 9)} D. {( 1, 9, 6)}

This Question is Closed

brandonloves
 3 years ago
Best ResponseYou've already chosen the best response.0we can start by clearing the z on the first two for starters. we do that by multiplying 2 to the first problem which makes it 4x+8y2z=44 and then add it to the second

brandonloves
 3 years ago
Best ResponseYou've already chosen the best response.0then multiply the last one times 2 so the z's will cancel

tkhunny
 3 years ago
Best ResponseYou've already chosen the best response.0Cramer's Rule? Well, I suppose we could simplify it a little, first, but that is a little unusual. You have four 3x3 determinates in your future.

brandonloves
 3 years ago
Best ResponseYou've already chosen the best response.0or you could do it that way. both take about as long to me...

tkhunny
 3 years ago
Best ResponseYou've already chosen the best response.0I see, so we're just ignoring problem statements. :(

Callisto
 3 years ago
Best ResponseYou've already chosen the best response.02x + 4y  z = 32 x  2y + 2z = 5 5x + y + z = 20 \[\Delta = \left \begin{matrix}2 & 4 &1\\ 1 & 2 & 2 \\ 5 &1 & 1\end{matrix}\right=...\] \[\Delta _{x} = \left \begin{matrix}32 & 4 &1\\ 5 & 2 & 2 \\ 20 &1 & 1\end{matrix}\right=...\] \[\Delta _{y} = \left \begin{matrix}2 & 32 &1\\ 1 & 5 & 2 \\ 5 & 20 & 1\end{matrix}\right=...\] \[\Delta _{z}= \left \begin{matrix}2 & 4 & 32\\ 1 & 2 & 5 \\ 5 &1 & 20\end{matrix}\right=...\] \[x =\frac{\Delta _{x}}{\Delta}\]\[y =\frac{\Delta _{y}}{\Delta}\]\[z =\frac{\Delta _{z}}{\Delta}\] Haven't used Cramer's Rule for long :(
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.