SOLUTION: ok so this is my equation. and i get it and all its just i cant get it to work but the teacher told us that i had to be in whole answers -2x+y+z=-2 5x+3y+3z=71 4x-2y-3z=1

Algebra ->  Algebra  -> College  -> Linear Algebra -> SOLUTION: ok so this is my equation. and i get it and all its just i cant get it to work but the teacher told us that i had to be in whole answers -2x+y+z=-2 5x+3y+3z=71 4x-2y-3z=1       Log On


   

Question 105860: ok so this is my equation.
and i get it and all its just i cant get it to work
but the teacher told us that i had to be in whole answers
-2x+y+z=-2
5x+3y+3z=71
4x-2y-3z=1
this is what i have tried so far..

5x+3y+3z=71
4x-2y-3z=1
-----------
9x+y=72
and then from there i have tried them all, and it just wont come out.!
please help me.!

Answer by scott8148(5880) About Me  (Show Source):
You can put this solution on YOUR website!
(3 times the first equation) added to the third equation gives -2x+y=-5 , so y=2x-5
...substitute into the equation you found to get x

9x+(2x-5)=72

use the x-value to find y; and then use the x and y values to find z