Vip quality exercise

So folks, How this come to be solved?

Graphically represent the points of the plane that verify:

a) 3x+4y>12 ^ 3x+4y>0
b) 3x+4y>12 v 3x+4y>0

Lol i know how to do it individually but I do not know what "^" and "v" means.

Hi folks, Op here with an related question:
I have this data:

A(-1,-6) B(-1,1)

And I need the equation of the AB line, and I try to get it by the "equation of a straight Line from two points":

y-y1=[(y2-y1)%(x2-x1)](x-x1)

So:

y+6=[(1+6)%(-1+1)](x+1)

But (1+6)%(-1+1) is 7/0 and x/0 does not exist.
That's cool because the slope is straight up and it isn't supposed to exist.
But how do I get the full-powered Line Equation from that? I can't multiply things with nothing. LOL