Question 785517
2x+y=17
y+z=6
x-z=7
=========
x-z=7 --> x = z+7
Sub for x in the 1st eqn
---
2x+y=17
2(z+7) + y = 17
y + 2z = 3
y + z = 6 (Equation 2)
------------------------- Subtract
z = -3
----
x = z + 7
x = 4
---------
y + z = 6
y = 9
--> (4,9,-3)