Question 148718
{{{4x+y=0}}}
First, put the equation into slope-intercept form,
{{{y=mx+b}}}
in your case,
{{{y=-4x}}}
Comparing to the general form, the slope, m, is then,
{{{m=-4}}}
and the y-intercept, b, is, 
{{{b=0}}} 
To graph, start at (0,0) and draw a line with slope -4.
{{{ graph( 300, 300, -10, 10, -10, 10, -4x) }}}