anonymous
  • anonymous
Solve using elimination method: 0.3x - 0.2y = 4 0.4x + 0.5y = 1
Mathematics
schrodinger
  • schrodinger
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anonymous
  • anonymous
My answer has to be in an ordered pair and can be used by integers or fractions. It also can have infinitely many solutions or none.
amistre64
  • amistre64
elimination is such a cruel method...
anonymous
  • anonymous
I do not understand elimination method at all. I can do substitution but not this stuff.

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anonymous
  • anonymous
i got (7.14,9.286) it's been awhile since ive done this
amistre64
  • amistre64
you simply eliminate a variable by multiplying or modifying one equation to be the opposite of the other... 0.3x - 0.2y = 4 0.4x + 0.5y = 1
anonymous
  • anonymous
Mjrizon, that is not correct.
amistre64
  • amistre64
3/10x - 2/10y = 4 4/10x + 5/10y = 1 (-3/4) 3/10x - 2/10y = 4 -3/10x -15/40y = -3/4
amistre64
  • amistre64
3/10x - 8/40y = 16/4 -3/10x -15/40y = -3/4 ---------------------- -23/40y = 13/4
anonymous
  • anonymous
oh ok sorry. forgot to multiply the right side of the equations by the multipliers.
anonymous
  • anonymous
please dont do all her homework.
anonymous
  • anonymous
hi amistre, i figured out the surface area problem
amistre64
  • amistre64
-23/40y = 13/4 y = 13/4 -40/23 y = 13/1 -10/23 = -130/23
anonymous
  • anonymous
I am stuck on three. Cant people help me with them.
amistre64
  • amistre64
thats great :)
anonymous
  • anonymous
blondie, you are being graded or not , be honest
anonymous
  • anonymous
oh ok sorry. forgot to multiply the right side of the equations by the multipliers.
anonymous
  • anonymous
yes i will be graded this is a checkpoint. i have the test for this next week though so it will be all new problems.
anonymous
  • anonymous
so youre cheating pretty much
amistre64
  • amistre64
is my "y" value good?
anonymous
  • anonymous
amistre, give her hints :) not answers
anonymous
  • anonymous
No im asking for help on these last three problems.
anonymous
  • anonymous
no you didnt ask for help. i read your log
anonymous
  • anonymous
you wanted the answer
anonymous
  • anonymous
youre not doing any work
anonymous
  • anonymous
Okay no i didnt just do any homework whatever. Ill go elsewhere to get help from people then because I dont cheat on my homework
amistre64
  • amistre64
4x 5 (-130) -- + -------- =1 10 10(23)
anonymous
  • anonymous
i dont mean to be rude but i dont see any work coming from you
anonymous
  • anonymous
If i am not doing any of my work then how is my grade an 87.5 for this checkpoint right now?
anonymous
  • anonymous
amistre, dont kill yourself
anonymous
  • anonymous
blondie ok . how did you get those answers
anonymous
  • anonymous
How did i get the other answers for my checkpoint? I was able to figure them out because it wasnt elimination method. It was substitution and graphing.
anonymous
  • anonymous
youre not asking questions, youre just being spoon fed answers . you would know about that
amistre64
  • amistre64
4x -65 -- + -------- =1 10 (23) 4x 23 + 65 -- = --------- 10 23 22 10 220 x = ------ = ---- if i didnt mess up along the way 23 23
anonymous
  • anonymous
this is not the place to post a thousand annoying homework problems,
anonymous
  • anonymous
post interesting problems
anonymous
  • anonymous
Yep sure would since my grades are at ah lets see an 89% overall. and I ASKED 3 NOT A THOUSAND
anonymous
  • anonymous
I think someone should mind their own business.
anonymous
  • anonymous
3 too many. 1 is a lot
anonymous
  • anonymous
well im looking out for my buddies
anonymous
  • anonymous
50 percent of the questions dont get answered, what makes you think youre entitled to it
anonymous
  • anonymous
90 percent of MY QUESTIONS HAVE NOT BEEN ANSWERED
anonymous
  • anonymous
anyways, amistre , just word to the wise
amistre64
  • amistre64
(3/10)(220/23) - (2/10)(-130/23) = 4 (3/1)(22/23) - (2/1)(-13/23) = 4 (66/23) + (26/23) = 4 92/23 = 4 ....4(23) = 92 that ones good
amistre64
  • amistre64
word to the wise? looks left...looks right.... :)
anonymous
  • anonymous
should i check your guys work? hmmm, i wonder if you can do this with determinants quickly
amistre64
  • amistre64
ess one question...and i most likely got it wrong, but might have gotten it right ;)
anonymous
  • anonymous
I agree with cantorset.
anonymous
  • anonymous
Although unfortunately people do NOT use this website to post interesting problems, although I guess it is not technically meant for that. If only it were :( So much better.
anonymous
  • anonymous
i mean youre free to do anything you want. i was just saying, dont exhaust yourself doing solutions without feedback
anonymous
  • anonymous
newton, yeah, ideally
amistre64
  • amistre64
oh i agree cantor.... i agree :)
anonymous
  • anonymous
oh believe me i wont come back to this website. I will find help elsewhere as i said. You can be a wingspan to someone else!!!
amistre64
  • amistre64
i was wondering if I could do the surface area of that torus with polar stuff....
anonymous
  • anonymous
i guess interesting is relative/subjective though
anonymous
  • anonymous
blondie, thats fine
anonymous
  • anonymous
You were a little harsh to her, specifically, though xD Though I do see that kind of thing on here a lot.
anonymous
  • anonymous
amistre, yes you can. i want to make a pdf of all the different ways to find surface area
amistre64
  • amistre64
what i came up with looked like a nightmare to integrate...but it was fun trying lol
anonymous
  • anonymous
i apologize im harsh today , but i do help
anonymous
  • anonymous
amistre oh its a fun problem, i will come back to it im going to help avnis , one sec
amistre64
  • amistre64
wish i could stay and play, but its 3am here and i gotta be able to get up and get my kids in a few hours;) nite nite yall ..
anonymous
  • anonymous
ok will post tomorrow im happy i figured it out on my own. nobody helped me here :(
amistre64
  • amistre64
your smart enough to do it on your own ;)
anonymous
  • anonymous
i peaked your interest , thats good
anonymous
  • anonymous
well i was stumped. but then i figured out it has to be integral 2pi x dS, to revolve about y axis integral 2pi y dS revolves about x axis ( and that makes a sphere)
anonymous
  • anonymous
thats why we got 4pi*r^2 something

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