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alyannahere
Group Title
solve the system
x  2y + z =4
x + 4y  3z =2
2x + y + 10z=10
 2 years ago
 2 years ago
alyannahere Group Title
solve the system x  2y + z =4 x + 4y  3z =2 2x + y + 10z=10
 2 years ago
 2 years ago

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rshextall Group TitleBest ResponseYou've already chosen the best response.1
What math are you in because you can either put this in a matrix which is faster or you can write it all out by hand
 2 years ago

Monkeyball Group TitleBest ResponseYou've already chosen the best response.0
Do you know matrices?
 2 years ago

alyannahere Group TitleBest ResponseYou've already chosen the best response.0
nope. i think it has to be the traditional way
 2 years ago

rshextall Group TitleBest ResponseYou've already chosen the best response.1
Then you need to solve for each variable one at a time. Do you need help getting started?
 2 years ago

alyannahere Group TitleBest ResponseYou've already chosen the best response.0
@rshextall yes please! :)
 2 years ago

rshextall Group TitleBest ResponseYou've already chosen the best response.1
Then lets start with the first equation and solve for x.
 2 years ago

rshextall Group TitleBest ResponseYou've already chosen the best response.1
Just add 2y and subtract z from both sides of the equation \[x2y+2y+zz=4+2yz\] \[x=4+2yz\]
 2 years ago

rshextall Group TitleBest ResponseYou've already chosen the best response.1
Do you see what happened there?
 2 years ago

rshextall Group TitleBest ResponseYou've already chosen the best response.1
Then you need to plug it into one of the other equations and solve for either y or z
 2 years ago

alyannahere Group TitleBest ResponseYou've already chosen the best response.0
so plugging it into the 2nd equation mates it 2y2z=6 ? then?
 2 years ago

rshextall Group TitleBest ResponseYou've already chosen the best response.1
It takes a while but it's not to difficult, but its easy to make simple mistakes like forgetting a minus sign and stuff
 2 years ago

rshextall Group TitleBest ResponseYou've already chosen the best response.1
Then solve for either y or z
 2 years ago

rshextall Group TitleBest ResponseYou've already chosen the best response.1
Then you have to both x and the other into the last equation and solve for the last variable
 2 years ago

rshextall Group TitleBest ResponseYou've already chosen the best response.1
You can check your answer by plugging your answers for x, y, and z into the first equations. They should work for all 3 equations
 2 years ago

rshextall Group TitleBest ResponseYou've already chosen the best response.1
Did you get it?
 2 years ago

alyannahere Group TitleBest ResponseYou've already chosen the best response.0
z=1 y=2 x=9. yup i got it thanks!
 2 years ago

alyannahere Group TitleBest ResponseYou've already chosen the best response.0
@rshextall but can you show me how to do the matrix, it's in the next lesson of the book so i think i should learn it too.
 2 years ago

rshextall Group TitleBest ResponseYou've already chosen the best response.1
You have to learn the rules of matrices. They're a bit more in depth than we can really get into on here. If you like I can help you with your homework with it when you get it
 2 years ago
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