Question 1064908
{{{2x+2y=16}}}
{{{x+y=8}}}
Add that to the second equation,
{{{x+y+3x-y=8+4}}}
{{{4x=12}}}
{{{x=3}}}
Then,
{{{3+y=8}}}
{{{y=5}}}
How about,
{{{x+y=8}}}
and
{{{x-y=-2}}}