SOLUTION: 2x-3y-z=0 x+y+z=3 4x-5y-z=2 I would like to know how to do this either by elimination or substitution i have it for a homework and i have to turn it in tomorrow and i dont kno

Algebra ->  Expressions-with-variables -> SOLUTION: 2x-3y-z=0 x+y+z=3 4x-5y-z=2 I would like to know how to do this either by elimination or substitution i have it for a homework and i have to turn it in tomorrow and i dont kno      Log On


   

Question 111383: 2x-3y-z=0
x+y+z=3
4x-5y-z=2
I would like to know how to do this either by elimination or substitution i have it for a homework and i have to turn it in tomorrow and i dont know how to do it i will appreciate your help
Thanks
Answer by scott8148(6628) About Me  (Show Source):
You can put this solution on YOUR website!
adding the second equation to the first gives 3x-2y=3 (a)

adding the second equation to the third gives 5x-4y=5 (b)

multiplying equation (a) by -2 gives -6x+4y=-6
___ adding this to equation (b) gives -x=-1

plugging back into previous equations will give values for y and z


this is called the elimination method because you eliminate variables until you are left with only one