Question 206601
You can choose to eliminate either x or y by substitution; x is easier.  Put the second equation in the form x=
{{{-x+y=1}}}
{{{x=y-1}}}
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Now replace x in the first equation with  {{{y-1}}}
{{{x+3y=2}}}
{{{y-1+3y=2}}}
{{{4y-1=2}}}
{{{4y=3}}}
{{{y=3/4}}}
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Use that value of y in one of the equations to find x.
{{{-x+3/4=1}}}
{{{-x=1/4}}}
{{{x=-1/4}}}