Question 36409
This is the graph:

{{{ graph (300,300, -6,6,-6,6, (3/4)*x+3)}}}


Now about how to GET the graph, when the problem is written in standard form like this one is, it's easiest to get the two intercepts.  


Given {{{3x-4y=-12}}}
If x =0, then -4y =-12, so y = 3.
If y=0, then 3x = -12, so x = -4.  


Plot these two points and connect the dots.  That's all there is to it.


R^2 at SCC