how do you go about solving 2 equations with 3 unkowns!?!? please kindly help .

-3a + 4b + c = 0
6a - 2b + c = 0

Question

how do you go about solving 2 equations with 3 unkowns!?!? please kindly help .

-3a + 4b + c = 0
  6a - 2b + c = 0

cwtan · Answer

1st equation minus 2nd equation it will be 2 unknown left

ash2326 · Answer

Assume any one of a or b or c and then find the other two

anonymous · Answer

rearrange the equations

precal · Answer

aren't we missing a third equation?

anonymous · Answer

c=3a-4b
c=2b-6a

anonymous · Answer

ohhh ! i gotit already ! thank you people ~!!

anonymous · Answer

ehh @studymathlol then witht that how find ??

anonymous · Answer

lol
since c = 3a-4b and c also =2b-6a

there fore c = c

and 3a-4b = 2b+ 6a

anonymous · Answer

geddit?

anonymous · Answer

yeap and then??

cwtan · Answer

and then find a in term of b sub into both equation

anonymous · Answer

how to get either a or b next?

anonymous · Answer

will come back to same eq.,..

anonymous · Answer

switch here switch there and you get

3a+6a=2b+4b
9a=6b

anonymous · Answer

yes and i tried finding a or b but subbing. i couldnt....=[

anonymous · Answer

precal is right we are missing a 3rd equation are you sure that is the full question? :/

anonymous · Answer

I think we need the third equation

anonymous · Answer

im not sure but i'm doing vectors chapters of alevel maths paper 3 questions.~

anonymous · Answer

trynna find equation from those vectors

anonymous · Answer

3 positiion vectors, find eq connecting all three

anonymous · Answer

yah or else you will get |dw:1336921388845:dw|