Question 841198
1.{{{x+3y=0}}}
2.{{{ 5x+y=14}}}
From eq. 1,
{{{x=-3y}}}
Substitute into eq. 2,
{{{5(-3y)+y=14}}}
{{{-15y+y=14}}}
{{{-14y=14}}}
{{{y=-1}}}
Then 
{{{x=-3(-1)}}}
{{{x=3}}}