Question 855180
Add them together to eliminate {{{y}}}.
{{{x-y+x+y=2+1}}}
{{{2x=3}}}
{{{x=3/2}}}
Then use either equation to solve for {{{x}}}.
{{{x-y=2}}}
{{{3/2-y=2}}}
{{{-y=4/2-3/2}}}
{{{-y=1/2}}}
{{{y=-1/2}}}