Determinant systems


by poon
Tags: determinant, systems
poon
poon is offline
#1
Dec26-12, 09:44 AM
P: 3
am not a math guru :P,am a newbie even if this should be solved by a newbie as well, Id like u guys to help me out to solve this one :

3x-y+2z=4

Im really needing this, thank you all.
Phys.Org News Partner Science news on Phys.org
NASA's space station Robonaut finally getting legs
Free the seed: OSSI nurtures growing plants without patent barriers
Going nuts? Turkey looks to pistachios to heat new eco-city
SteamKing
SteamKing is offline
#2
Dec26-12, 10:04 AM
HW Helper
Thanks
P: 5,554
One equation, three unknowns.

You can solve this equation as long as you pick values for any two of the unknowns.
poon
poon is offline
#3
Dec26-12, 10:16 AM
P: 3
Quote Quote by SteamKing View Post
One equation, three unknowns.

You can solve this equation as long as you pick values for any two of the unknowns.
can u give me a hand now ? :)
3x+y+2z=4
2x+3y-z=4
2x-y-z=0

rock.freak667
rock.freak667 is offline
#4
Dec26-12, 10:45 AM
HW Helper
P: 6,213

Determinant systems


You could either convert it into a matrix equation and solve it.

Or you can use one equation to modify the other two, and then solve those two simultaneously. For example if you take the last equation and substitute it into the first 2, then solve the now modified first two you will get two of the solutions.
poon
poon is offline
#5
Dec26-12, 10:54 AM
P: 3
Thank you guys. But when its up to math in english im not good,actually im not understanding this that much, i need someone to solve it in mathematical view..
rock.freak667
rock.freak667 is offline
#6
Dec26-12, 11:36 AM
HW Helper
P: 6,213
Quote Quote by poon View Post
Thank you guys. But when its up to math in english im not good,actually im not understanding this that much, i need someone to solve it in mathematical view..
Do you know how to form a matrix equation from a system of equations?

3x+y+2z=4 (1)
2x+3y-z=4 (2)
2x-y-z=0 (3)

If you take equation 2 and subtract that from equation 3, what equation are you left with?

Similarly, if you take equation 1 and add that to 2*equation 3, what equation are you left with?


Register to reply

Related Discussions
Interested in Chaos Theory, Complex Systems, Nonlinear Systems Academic Guidance 8
Finding determinant given determinant of another matrix Calculus & Beyond Homework 3
Solving a determinant using another determinant Precalculus Mathematics Homework 1
Trace-determinant plane: underdamped systems Calculus & Beyond Homework 0
Multi-Step linear systems problem - Build ODE, impulse response, systems balance Calculus & Beyond Homework 12