Got Homework?
Connect with other students for help. It's a free community.
Here's the question you clicked on:
 0 viewing
ilikequadraticsokay
Group Title
Solve the system by elimination;
4a  2b + 3c = 10
5a + 2b  2c = 28
3a  2b + c = 22
 one year ago
 one year ago
ilikequadraticsokay Group Title
Solve the system by elimination; 4a  2b + 3c = 10 5a + 2b  2c = 28 3a  2b + c = 22
 one year ago
 one year ago

This Question is Closed

timo86m Group TitleBest ResponseYou've already chosen the best response.0
pic one variable of one equation and solve for it. LIke pick c of bottom most equation and solve for it then plug it into middle equation
 one year ago

ilikequadraticsokay Group TitleBest ResponseYou've already chosen the best response.0
how do you eliminate the a and b though?
 one year ago

ilikequadraticsokay Group TitleBest ResponseYou've already chosen the best response.0
i end up with 4a  2b + 3c = 10 5a + 2b  2c = 28 3a  2b + c = 22 4a  2b + 3c = 10 5a + 2b  2c = 28 c = 22 + 3a +2b
 one year ago

timo86m Group TitleBest ResponseYou've already chosen the best response.0
dw:1364154910112:dw
 one year ago

kelliegirl33 Group TitleBest ResponseYou've already chosen the best response.2
take the first two equations and add them...this will cancel out the b's
 one year ago

timo86m Group TitleBest ResponseYou've already chosen the best response.0
wait i was doing substitution sorry @ilikequadraticsokay
 one year ago

timo86m Group TitleBest ResponseYou've already chosen the best response.0
the link i gave has a great example
 one year ago

kelliegirl33 Group TitleBest ResponseYou've already chosen the best response.2
4a  2b + 3c =  10 5a + 2b  2c =  28  9a + c =  38 now take the next two equations and eliminate b. 5a + 2b  2c =  28 3a  2b + c = 22  2a  c =  6 now take the 2 equations you came up with...the ones you cancelled out the b's in. 9a + c =  38 2a  c =  6  11a =  44 a =  4 now sub 4 in for a in either of the above equations 9a + c =  38 9(4) + c =  38  36 + c =  38 c =  38 + 36 c =  2 now sub known values into any of the original equations 4a  2b + 3c = 10 4(4)  2b + 3(2) =  10 16  2b  6 =  10 2b =  10 + 22 2b = 12 b = 6 lets check... 5a + 2b  2c =  28 5(4) + 2(6)  2(2) =  28 20  12 + 4 =  28  32 + 4 =  28  28 =  28 (correct) a = 4, b = 6, c = 2 Is there anything I have just done that you don't understand ? I will be happy to explain it to you.
 one year ago

ilikequadraticsokay Group TitleBest ResponseYou've already chosen the best response.0
You explained this perfectly, thank you!
 one year ago

kelliegirl33 Group TitleBest ResponseYou've already chosen the best response.2
your welcome :)
 one year ago
See more questions >>>
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.