Question

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

Answer 1

I think it's A or E.

Answer 2

it is D

Answer 3

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

Answer 4

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.

Answer 5

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

Answer 6

D is not right

Answer 7

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

Answer 8

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

Answer 9

that is tree lee, mmm im lost now lol

Answer 10

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.

Answer 11

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

Answer 12

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

Answer 13

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

Answer 14

okay

Answer 15

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

Answer 16

lol iHelp

Answer 17

So is it D Luis?

Answer 18

(4.5,6) is another solution =0

Answer 19

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

Answer 20

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.

Answer 21

clear?

Answer 22

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

Answer 23

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

Answer 24

let me check one more time

Answer 25

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

Answer 26

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

Answer 27

sry but i still dont get same line >.<

Answer 28

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

Answer 29

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 ?

Answer 30

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

Answer 31

haha np :P