Question 281146
Mutliply eq. 2 by 5 and add to eq. 1,
{{{7x+10y+(15x-10y)=-13+35}}}
{{{22x=22}}}
{{{x=1}}}
Then from eq. 2,
{{{3x-2y=7}}}
{{{3(1)-2y=7}}}
{{{3-2y=7}}}
{{{-2y=4}}}
{{{y=-2}}}