Question 877854
Add the two equations together to eliminate {{{y}}}
{{{3x-y+4x+y=10+15}}}
{{{7x=25}}}
{{{x=25/7}}}
Then use either equation to solve for {{{y}}}
{{{4(25/7)+y=15}}}
{{{y=105/7-100/7}}}
{{{y=5/7}}}