Question

How to solve this?

Answer 1

3A-B-2C=5
2A+B+3C=6
6A-B+4C=9

solve for 3 unkowns

Answer 2

Please answer clearly and explain the solution clearly and easy to understand. Thanks!
(guaranteed medal for a good answer)

Answer 3

please show your solutions

Answer 4

i would use elimination.
btw can you use a graphing calculator

Answer 5

i don't have a graphing calculator.
can you show me eliminating it?

Answer 6

Can two letters be the same number?

Answer 7

you have to use partial fractions

Answer 8

A = 62/27, B =- 25/27, C =-13/27
that is the answer i just don't know how it became that answer

Answer 9

3(2)-1-2(0)
6-1-0
5-0
5!

Answer 10

please use the arithmetic method

Answer 11

what is the arithmetic method?

Answer 12

i think it the eq. 1 +eq.2

Answer 13

then so on

Answer 14

ok lets eliminate B first
Add top 2 equations together
3A -B-2C = 5
2A+B+3C =6
-------------
(i) 5A +C = 11
Next add bottom 2 equations together, this will eliminate B again
2A+B+3C = 6
6A-B+4C = 9
-------------
(ii) 8A +7C = 15

Now solve equations (i) and (ii), lets eliminate C
Multiply (i) by -7
Then add (i) and (ii)
-35A -7C = -77
8A +7C = 15
----------------
-27A = -62
A = 62/27
Substitute into (ii) to solve for C
8(62/27) +7C = 15
7C = 15 - (496/27)
C = 15/7 - (496/189)
C = -91/189
Substitute A and C into one of the original equation to solve for B
2A +B+3C = 6
2(62/27) +B +3(-91/189) = 6
B = 6 + (273/189) -(124/27)
B = 539/189

Answer 15

why is it you have a different answer for B?

Answer 16

mine aren't reduced all the way and i prob made a mistake cause working with huge fractions

Answer 17

actually i verified it, i think you have a wrong answer for B

Answer 18

dumbcows answers are correct

Answer 19

ohh thanks maybe the answer key is wrong
^_^

Answer 20

the reduced answer for B is 77/27

Answer 21

is it ok to subtitute the value of A in 5A +C = 11 to solve for C?

Answer 22

because i am getting a different answer when i am doing that

Answer 23

oh i didn't see that you responded
yes it is, either equation would work

Answer 24

ok
so A = 62/27
5A +C = 11
5(62/27) + C = 11
C = 11 - 310/27
C = 297/27 - 310/27
C = -13/27

Answer 25

does that help? see what happened

Answer 26

why it became

C = 297/27 - 310/27
???

Answer 27

rewrote 11 as 297/27
11*(27/27) = (11*27)/27 = 297/27

Answer 28

ohh i get it now i multplied 5 to 62/7 that is why i am getting a wrong answer :)
thanks!