Question 53348
This is difficult to show you online, if you have questions about something I was unclear about let me know.
You said you knew how to plot points.  If you were to connect the dots you'd get a line that looks like this:
{{{graph(300,200,-10,10,-10,10,(3/2)x+6)}}}
A parallel line going through the origin, would have the same slope or slant.  Graphically you could find the slope by counting the units up or down/units left or right.
Algebraically, we have a formula for slope (m):
{{{m=(y2-y1)/(x2-x1)}}}
{{{m=(6-0)/(0-(-4))}}}
{{{m=6/4}}}
{{{m=3/4}}}
Our second line would start at (0,0) and go up 3 units and right 4 units to (4,3), where you'd plot another point connect the dots and you have:
{{{graph(300,200,-10,10,-10,10,(3/2)x)}}}
Together the two lines look like this:
{{{graph(300,200,-10,10,-10,10,(3/2)x+6,(3/2)x)}}}