Question 177561
Add the two equations together and solve for x.
Then go back and solve for y. 
1.{{{2x+y=3}}}

2.{{{x-y=3}}}
.
.
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{{{(2x+y)+(x-y)=3+3}}}
{{{3x=6}}}
{{{highlight(x=2)}}}
Then from eq. 2,
2.{{{x-y=3}}}
{{{2-y=3}}}
{{{-y=1}}}
{{{highlight(y=-1)}}}