Posted by %%%Rena%%% on Sunday, July 1, 2012 at 3:32pm.
use 2 x for y
x + 2x = 0
3 x = 0
x = 0
y = 0
======================
to graph
first one
when x = 0, y = 0, so through origin (0,0)
pick another x
when x = 1, y = 2 so through (1,2)
draw that line
second one
when x = 0, y = 0, so through origin (0,0)
when x = 1, y = -1, so through (1,-1)
draw that line.
They cross, sure enough, at (0,0)