SOLUTION: how do you solve each system of simultaneous equations by using the substitution method. x+y=3 3x+2y=9

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Question 351828: how do you solve each system of simultaneous equations by using the substitution method.
x+y=3
3x+2y=9
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
1.x%2By=3
2.3x%2B2y=9
From eq. 1,
x=3-y
Substitute into eq. 2,
3%283-y%29%2B2y=9
9-3y%2B2y=9
-y=0
highlight%28y=0%29
Then from eq. 1,
x%2B0=3
highlight%28x=3%29