X + Y + Z = 36
4X + 2Y + Z = 71
6X + 5Y + 4Z = 86 HELP!! System of equations.

Question

blurbendy · Answer

have you tried the elimination method?

anonymous · Answer

I'm really honestly confused with this...

blurbendy · Answer

the elimination method?

anonymous · Answer

Yes, how do I do that?!

blurbendy · Answer

it's fun.  first pick a variable you want to KILL

anonymous · Answer

I'm taking online classes but it doesn't explain how to do it...

blurbendy · Answer

i will show you.  choose a variable you want to eliminate.  ANY ONE.

kainui · Answer

KILL THEM ALL!

anonymous · Answer

Ahh, thank's! x?

blurbendy · Answer

DIE!

anonymous · Answer

tired matrix method?

blurbendy · Answer

Let's kill 4x, it will be easier.  here's why:

in order to eliminate 4x, all we have to do is multiply the top equation by -4.  if we do that, we're left with

-4x -4Y -4Z = -144

+

4x + 2Y +Z = 71

Now add these two equations

anonymous · Answer

Will do! So, together I got.... x-2y-3z=-73. Not sure if it's correct.

anonymous · Answer

Is that how you do it?

blurbendy · Answer

close, -4x + 4x = 0, s the x variable is gone now

anonymous · Answer

Oh, well that wasn't close enough. :(

anonymous · Answer

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