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EmmaH
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PLEASE HELP!!!! Solve the system, using substitution. One point for correct steps, one point for correct ordered pair, (a,b).
a + b = 4 and 2a + 3b = 11
i tried to solve for a but ended up with 1/5 i dont think thats right....
 one year ago
 one year ago
EmmaH Group Title
PLEASE HELP!!!! Solve the system, using substitution. One point for correct steps, one point for correct ordered pair, (a,b). a + b = 4 and 2a + 3b = 11 i tried to solve for a but ended up with 1/5 i dont think thats right....
 one year ago
 one year ago

This Question is Closed

ayushprasad Group TitleBest ResponseYou've already chosen the best response.0
dw:1356562594798:dw
 one year ago

seidi.yamauti Group TitleBest ResponseYou've already chosen the best response.2
a+b=4 2a+3b=11 a=4b 2(4b)+3b=11 (substituing a as found) a=4b 8+b=11 a=4b b=3 so, a=1 and b=3
 one year ago

EmmaH Group TitleBest ResponseYou've already chosen the best response.0
a=4b 2(4b)+3b=11 i get that but how did ypu go from that to a=4b 8+b=11
 one year ago

seidi.yamauti Group TitleBest ResponseYou've already chosen the best response.2
you need first to isolate a or b in one of the equations, and use this on the other. I have skipped one or two steps, but if you do correctly, the answer (a,b)=(1,3) will be found
 one year ago

seidi.yamauti Group TitleBest ResponseYou've already chosen the best response.2
2(4b) = 82b, write it and keep solving
 one year ago

seidi.yamauti Group TitleBest ResponseYou've already chosen the best response.2
This problem is about solving what is called 'linear system'. You have some equations with letters and need to find what are their values. Further you will see that not all of this kind of systems can be solved (when there are more letters than equations)  but you can just ignore it by now tell me when you're done, it just a matter of practice to solve it better an faster
 one year ago

EmmaH Group TitleBest ResponseYou've already chosen the best response.0
ok question: in 2(4b)+3b=11 would it equal 8b+3b=11 or 82b+3b=11?
 one year ago

seidi.yamauti Group TitleBest ResponseYou've already chosen the best response.2
82b+3b=11
 one year ago

seidi.yamauti Group TitleBest ResponseYou've already chosen the best response.2
because the 2 multipies both 4 and b in 2(4b)
 one year ago

EmmaH Group TitleBest ResponseYou've already chosen the best response.0
this is what i got 8b+3b=11 8+2b=11 2b=118 2b=3 2b/2=3/2
 one year ago

seidi.yamauti Group TitleBest ResponseYou've already chosen the best response.2
redo it haha it is 82b+3b=11 but what you've done is right if it was 8b+3b=11
 one year ago

taylorstenger Group TitleBest ResponseYou've already chosen the best response.1
dw:1356564451980:dw
 one year ago

seidi.yamauti Group TitleBest ResponseYou've already chosen the best response.2
kind of what taylor said... You need to do all by yourself, and just ask for some tips. Because it is when you think alone that you really understand. try and try and try. It's hard, but sometime there will be just the right answer
 one year ago

taylorstenger Group TitleBest ResponseYou've already chosen the best response.1
Yup. U cant just go on the internet and find answers for everything and anything. Theres a reason its in ur text books, and theres a reason teachers teach it to u. If u paid attention, u wouldnt be askin questions on OpenStudy ;)
 one year ago

EmmaH Group TitleBest ResponseYou've already chosen the best response.0
im not trying to gte an easy answer i honestly dont understand this also i didnt respond bcs my inter net went out
 one year ago

seidi.yamauti Group TitleBest ResponseYou've already chosen the best response.2
I was just complementing. Just to say, first step, you can ask a lot about your doubt, but with time, you will do it without any help. haha
 one year ago

EmmaH Group TitleBest ResponseYou've already chosen the best response.0
im really confused about what to do after i get 2b=3 can you please continue to help me?
 one year ago

seidi.yamauti Group TitleBest ResponseYou've already chosen the best response.2
i'm here. Let's see..
 one year ago

seidi.yamauti Group TitleBest ResponseYou've already chosen the best response.2
where is 2b=3 ?
 one year ago

EmmaH Group TitleBest ResponseYou've already chosen the best response.0
82b=11 2b=118 2b=3
 one year ago

seidi.yamauti Group TitleBest ResponseYou've already chosen the best response.2
you have a+b=4 2a+3b=11 then, you use ANY of these equations to isolate a letter in the case, I've used the first and came up with a=4b (so, from now on, that's what a is) you could also do it in the second, but that's too much work
 one year ago

seidi.yamauti Group TitleBest ResponseYou've already chosen the best response.2
I isolated a, but it could be also b. both correct
 one year ago

EmmaH Group TitleBest ResponseYou've already chosen the best response.0
thisd is what ive done a + b = 4 and 2a + 3b = 11 2(4b)+3b=11 8b+3b=11 82b=11 2b=118 2b=3
 one year ago

seidi.yamauti Group TitleBest ResponseYou've already chosen the best response.2
2(4b)+3b=11 8b+3b=11 This is not right, because when you multiply a number times something in parenthesis, everything inside is multiplied so 2(4b)+3b=11 what comes next?
 one year ago

seidi.yamauti Group TitleBest ResponseYou've already chosen the best response.2
yes!
 one year ago

seidi.yamauti Group TitleBest ResponseYou've already chosen the best response.2
and i guess, if you go back to my first post, it will make more sense now
 one year ago

EmmaH Group TitleBest ResponseYou've already chosen the best response.0
81b=11 1b=118 1b=3 1b/1=3/1 b=3 is that right
 one year ago

seidi.yamauti Group TitleBest ResponseYou've already chosen the best response.2
nonononoooo you've got 82b+3b=11 which is equal to 8+b=11 not 8b=11
 one year ago

EmmaH Group TitleBest ResponseYou've already chosen the best response.0
8+b=11 b=3 ??
 one year ago

seidi.yamauti Group TitleBest ResponseYou've already chosen the best response.2
YES! hahahaha
 one year ago

seidi.yamauti Group TitleBest ResponseYou've already chosen the best response.2
That's it :)
 one year ago

EmmaH Group TitleBest ResponseYou've already chosen the best response.0
thank you for taking the time to help me!
 one year ago

seidi.yamauti Group TitleBest ResponseYou've already chosen the best response.2
i've found the khan academy page on algebra. https://www.khanacademy.org/math/algebra This may help you
 one year ago

seidi.yamauti Group TitleBest ResponseYou've already chosen the best response.2
and you're welcome
 one year ago
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