Question 342265
{{{2x-y=12}}} 
{{{x+3y=13 }}}

From eq. 1,
{{{y=2x-12}}}
Substitute into eq. 2,
{{{x+3(2x-12)=13}}}
{{{x+6x-36=13}}}
{{{7x=49}}}
{{{highlight(x=7)}}}
Then from eq. 1,
{{{y=2(7)-12}}}
{{{y=14-12}}}
{{{highlight(y=2)}}}