AonZ
  • AonZ
Simutaneosly solve x-5y-z=13 2x+y+z=0 -3x+y+2z=11
Mathematics
chestercat
  • chestercat
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AonZ
  • AonZ
I know how to solve 2 simutaneous equations but no idea about 3
AonZ
  • AonZ
i rather the elimination method :P
hartnn
  • hartnn
ok, so if i help you get 2 equations in x and y only , will you be able to solve the rest ? 1) Add 1st and 2nd equation, what u get ?

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AonZ
  • AonZ
3x-4y=13
AonZ
  • AonZ
i just need the steps in which to complete it i think
hartnn
  • hartnn
now multiply 1st equation by 2
AonZ
  • AonZ
6x-8y=26
hartnn
  • hartnn
:O how ?
AonZ
  • AonZ
2x-10y-2z=26
hartnn
  • hartnn
now add it with 3rd equation.....
AonZ
  • AonZ
-x-9y=37 Btw does it matter if you add the 2nd to the 3rd eqution instead of 1st to 3rd?
hartnn
  • hartnn
if you add 2nd and 3rd equation, you could not have eliminated 'z'
hartnn
  • hartnn
now can you find 'x' and 'y' ?
AonZ
  • AonZ
y=-4?
AonZ
  • AonZ
x=-1
hartnn
  • hartnn
yes.
hartnn
  • hartnn
now can u find z ?
AonZ
  • AonZ
mhm... I sub x and y into the 1,2,3 equation?
AonZ
  • AonZ
ok z =6 thank you
hartnn
  • hartnn
yes, correct :) ask if any doubts.

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