Question 989590
SOLVE:
x+y=7
y+z=8
x+2z=2 
----
express y and x in terms of "z"::
y = 8-z
x = 2-2z
------
Substitute for x and y and solve for "z"::
2-2z + 8-z = 7
-3z + 10 = 7
-3z = -3
z = 1
----
y = 8-z = 7
x = 2 - 2z = 2-2 = 0
----------
Cheers,
Stan H.
-------------