Question 329747
ELimination:
Add the equations together.
{{{x + y + x - y =-4+ 2}}}
{{{2x=-2}}}
{{{highlight(x=-1)}}}
.
.
.
Then use either equation to solve for y.
{{{-1+y=-4}}}
{{{highlight(y=-3)}}}
.
.
.
Substitution:
From eq. 1,
{{{y=-x-4}}}
Substitute into eq. 2,
{{{x-(-x-4)=2}}}
{{{x+x+4=2}}}
{{{2x=-2}}}
{{{highlight_green(x=-1)}}}
Then from above,
{{{y=1-4}}}
{{{highlight_green(y=-3)}}}