x + 3y - z = 13

2x -5z = 23

4x - y -2z = 14

I have no idea how to start this. please help me! thanks.

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- Mar 30th 2008, 07:13 AMsnidermanSystems of Linear Equations
x + 3y - z = 13

2x -5z = 23

4x - y -2z = 14

I have no idea how to start this. please help me! thanks. - Sep 15th 2013, 10:54 PMbrosnan123Re: Systems of Linear Equations
Solution:

Given x + 3y - z = 13....(1)

2x -5z = 23...(2)

4x - y -2z = 14 ..(3)

multiply (1) by 4

4x+12y-4z=52

and subtract (1) with (3)

13y-2z=38

again multiply (3 )by 3

we get 12x-3y-6z=42

subtract it by (1)

we get (13x-7z=55)*5

again (2x -5z = 23)*7

solving this we get x=38/17

y=40/17

z=-63/17