Solve the system by using elimination or elimination with multiplication.
3x - 2y = 9 and -3x + 2y = -9
A. (3, 0)
B. (5, 6)
C. (1, -3)
D. no solution
E. infinitely many solutions

- anonymous

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- anonymous

I think it's A or E.

- anonymous

it is D

- anonymous

A and C works =0, so wouldnt it be many solutions

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- anonymous

i thought so but then I looked up the definition of infinitely many solutions and it said that it meant tht u can never run out of possible solutions..so then I had second thoughts.

- anonymous

sorry how does C work, I think it is just A

- anonymous

D is not right

- anonymous

Lol, i think i am confusing you, yes C does work

- anonymous

yea u r kind of confusing me..u just named three answers. :) lol

- anonymous

that is tree lee, mmm im lost now lol

- anonymous

hahahaahha, am sorry. :D
well when i trying susbtitution, I got the answer 3,0
i dont know how u can, get 1,-3, but when u plug it in then it is a solution.
so i think is it infinite solutions.

- anonymous

i solved for x, and plug it into other equations- i got 0.. so no solution =0

- anonymous

I definitely know tht no solution is wrong but I think it is infinitely solution...So we r going to go with E.

- anonymous

i have a graphing calculator, i will solve the problem now. wait

- anonymous

okay

- anonymous

i had calculation wrong, i change my answer to infinity lol

- anonymous

lol iHelp

- anonymous

So is it D Luis?

- anonymous

(4.5,6) is another solution =0

- anonymous

we just have to wait for Sal to c if we r right.

- anonymous

ok it is E, system has infinite solutions, becuase in fact the two lines are the same, if you try and isolate for y, in both cases you will get the same line y=(-9+3x)/2. Hence, the two lines are on top of each other and they interesct at infinite points, this is how you have infinit solution.

- anonymous

clear?

- anonymous

yea i get now..thts wat I thought it was..but thnk u for checking.

- anonymous

same line?,, one has negative slope, and the other is positive....

- anonymous

let me check one more time

- anonymous

no, they are the same line. Try to isolate for y for both lines

- anonymous

yea they r the same line...he's right and so am I so we r going with E.

- anonymous

sry but i still dont get same line >.<

- anonymous

lol, the signs are confusing. i was checking like 3 times. try and get y on its own and everything to the right side.

- anonymous

by graphing wat i got for those equations... i got (3,0) as solutions now--- btw, u just solve for y in those 2 equation right ?

- anonymous

nvm 4th check, i got same line-- blame the SIGNs-- thanks

- anonymous

haha np :P

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