- anonymous

Solve using elimination method:
0.3x - 0.2y = 4
0.4x + 0.5y = 1

- schrodinger

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- 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

elimination is such a cruel method...

- anonymous

I do not understand elimination method at all. I can do substitution but not this stuff.

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## More answers

- anonymous

i got (7.14,9.286) it's been awhile since ive done this

- 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

Mjrizon, that is not correct.

- 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

3/10x - 8/40y = 16/4
-3/10x -15/40y = -3/4
----------------------
-23/40y = 13/4

- anonymous

oh ok sorry. forgot to multiply the right side of the equations by the multipliers.

- anonymous

please dont do all her homework.

- anonymous

hi amistre, i figured out the surface area problem

- amistre64

-23/40y = 13/4
y = 13/4
-40/23
y = 13/1
-10/23 = -130/23

- anonymous

I am stuck on three. Cant people help me with them.

- amistre64

thats great :)

- anonymous

blondie, you are being graded or not , be honest

- anonymous

oh ok sorry. forgot to multiply the right side of the equations by the multipliers.

- 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

so youre cheating pretty much

- amistre64

is my "y" value good?

- anonymous

amistre, give her hints :) not answers

- anonymous

No im asking for help on these last three problems.

- anonymous

no you didnt ask for help. i read your log

- anonymous

you wanted the answer

- anonymous

youre not doing any work

- 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

4x 5 (-130)
-- + -------- =1
10 10(23)

- anonymous

i dont mean to be rude but i dont see any work coming from you

- anonymous

If i am not doing any of my work then how is my grade an 87.5 for this checkpoint right now?

- anonymous

amistre, dont kill yourself

- anonymous

blondie ok . how did you get those answers

- 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

youre not asking questions, youre just being spoon fed answers . you would know about that

- 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

this is not the place to post a thousand annoying homework problems,

- anonymous

post interesting problems

- anonymous

Yep sure would since my grades are at ah lets see an 89% overall. and I ASKED 3 NOT A THOUSAND

- anonymous

I think someone should mind their own business.

- anonymous

3 too many. 1 is a lot

- anonymous

well im looking out for my buddies

- anonymous

50 percent of the questions dont get answered, what makes you think youre entitled to it

- anonymous

90 percent of MY QUESTIONS HAVE NOT BEEN ANSWERED

- anonymous

anyways, amistre , just word to the wise

- 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

word to the wise? looks left...looks right.... :)

- anonymous

should i check your guys work? hmmm, i wonder if you can do this with determinants quickly

- amistre64

ess one question...and i most likely got it wrong, but might have gotten it right ;)

- anonymous

I agree with cantorset.

- 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

i mean youre free to do anything you want. i was just saying, dont exhaust yourself doing solutions without feedback

- anonymous

newton, yeah, ideally

- amistre64

oh i agree cantor.... i agree :)

- 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

i was wondering if I could do the surface area of that torus with polar stuff....

- anonymous

i guess interesting is relative/subjective though

- anonymous

blondie, thats fine

- anonymous

You were a little harsh to her, specifically, though xD Though I do see that kind of thing on here a lot.

- anonymous

amistre, yes you can. i want to make a pdf of all the different ways to find surface area

- amistre64

what i came up with looked like a nightmare to integrate...but it was fun trying lol

- anonymous

i apologize im harsh today , but i do help

- anonymous

amistre oh its a fun problem, i will come back to it
im going to help avnis , one sec

- 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

ok will post tomorrow
im happy i figured it out on my own. nobody helped me here :(

- amistre64

your smart enough to do it on your own ;)

- anonymous

i peaked your interest , thats good

- 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

thats why we got 4pi*r^2 something

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