Question

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

Answer 1

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.

Answer 2

elimination is such a cruel method...

Answer 3

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

Answer 4

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

Answer 5

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

Answer 6

Mjrizon, that is not correct.

Answer 7

3/10x - 2/10y = 4
4/10x + 5/10y = 1 (-3/4)

3/10x - 2/10y = 4
-3/10x -15/40y = -3/4

Answer 8

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

Answer 9

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

Answer 10

please dont do all her homework.

Answer 11

hi amistre, i figured out the surface area problem

Answer 12

-23/40y = 13/4

y = 13/4
-40/23

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

Answer 13

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

Answer 14

thats great :)

Answer 15

blondie, you are being graded or not , be honest

Answer 16

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

Answer 17

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.

Answer 18

so youre cheating pretty much

Answer 19

is my "y" value good?

Answer 20

amistre, give her hints :) not answers

Answer 21

No im asking for help on these last three problems.

Answer 22

no you didnt ask for help. i read your log

Answer 23

you wanted the answer

Answer 24

youre not doing any work

Answer 25

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

Answer 26

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

Answer 27

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

Answer 28

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

Answer 29

amistre, dont kill yourself

Answer 30

blondie ok . how did you get those answers

Answer 31

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.

Answer 32

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

Answer 33

4x -65
-- + -------- =1
10 (23)


4x 23 + 65
-- = ---------
10 23


22 10 220
x = ------ = ---- if i didnt mess up along the way
23 23

Answer 34

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

Answer 35

post interesting problems

Answer 36

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

Answer 37

I think someone should mind their own business.

Answer 38

3 too many. 1 is a lot

Answer 39

well im looking out for my buddies

Answer 40

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

Answer 41

90 percent of MY QUESTIONS HAVE NOT BEEN ANSWERED

Answer 42

anyways, amistre , just word to the wise

Answer 43

(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

Answer 44

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

Answer 45

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

Answer 46

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

Answer 47

I agree with cantorset.

Answer 48

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.

Answer 49

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

Answer 50

newton, yeah, ideally

Answer 51

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

Answer 52

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!!!

Answer 53

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

Answer 54

i guess interesting is relative/subjective though

Answer 55

blondie, thats fine

Answer 56

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

Answer 57

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

Answer 58

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

Answer 59

i apologize im harsh today , but i do help

Answer 60

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

Answer 61

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 ..

Answer 62

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

Answer 63

your smart enough to do it on your own ;)

Answer 64

i peaked your interest , thats good

Answer 65

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)

Answer 66

thats why we got 4pi*r^2 something