SOLUTION: what is the step for solving: x+y=4 x+z=4 y+z=4

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Question 220740: what is the step for solving:
x+y=4
x+z=4
y+z=4
Answer by Alan3354(69443) About Me  (Show Source):
You can put this solution on YOUR website!
what is the step for solving:
x+y=4
x+z=4
y+z=4
---------
There are several methods. One is to look at it and see that
x = y = z = 2
-------------
Another is elimination and substitution.
x+y=4 Eqn 1 --> x=4-y
x+z=4 Eqn 2
y+z=4 Eqn 3
-----------Sub for x into Eqn 2
x+z = 4
4-y + z = 4
y = z
Sub for y into Eqn 3
z+z = 4
z = 2
-----
y = 2
-----
x = 2