Question 1153786
----------------
2x+y=0
x+4y=-7
----------------


{{{x+4(-2x)=-7}}}
{{{x-8x=-7}}}
{{{-7x=-7}}}
{{{highlight(x=1)}}}


{{{highlight(y=-2)}}}


If those are not what you are looking for, then you need to ask what you wanted to know.