Question 768656


{{{x + y =12}}}....eq.1
{{{x-y=-2}}}........eq.2
_________________________add both

{{{x + y+ x-y=12+(-2)}}}

{{{2x +cross( y)-cross(y)=12-2}}}

{{{2x=10}}}

{{{x=10/2}}}

{{{highlight(x=5)}}}

now go back to eq.1 or eq.2 and find {{{y}}}

{{{x + y =12}}}....eq.1...plug in {{{x}}}

{{{5 + y =12}}}

{{{y =12-5}}}

{{{highlight(y =7)}}}