Posted by paul on Sunday, November 14, 2010 at 7:27am.
Substitute 11 -3y for x in the second equation.
Why? Because the first equation tells you that
x = 11 -3y.
You should get
3(11 -3y)= 3 + y
33 - 9y = 3 + y
10y = 30
y = ___ ?
Then solve for x, using either of the first two equations you were given.
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