Question 101062
How would I Graph the line with equation? 

y= -x
Here is how you should approach every graphing problem
pick a number for x, say 0 then y=0
now pick x=1 then y=-1
now you have two points (0,0) and (1,-1) (you only need two points to graph a line
so plot those points, connect them and you got yourself your graph :)
{{{ graph( 300, 300, -4, 4, -4, 4, -x) }}}