SOLUTION: systems of equations: substitution x+y=6 y=x how do I solve that by substitution?

Question 282223: systems of equations: substitution
x+y=6
y=x
how do I solve that by substitution?
Found 2 solutions by Mathematicians, jim_thompson5910:
Answer by Mathematicians(84) (Show Source): You can put this solution on YOUR website!
Check this cool thing out.

We said y = x right?
Then this equals

combine like terms
solve for y.
since

There you go ;)
Answer by jim_thompson5910(35256) (Show Source): You can put this solution on YOUR website!
Simply plug in into to get (notice how I replaced 'y' with 'x'). Now solve for 'x'. Once you have a solution in terms of 'x', use it to find the solution in terms of 'y'.

Note: in this case, the two solutions of 'x' and 'y' will be the same (since )
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