<PRE><B>Question 922419</B>
Re: TY
when using 
y = mx + b
-12 = 3(-11) + b
21 = b
and y = 3x + 21, a positive slope tells us the line slants towards the right.
.....
Choosing two points to plot and connect, reaffirms that.
***Using point-slope form, {{{y - y[1] = m(x - x[1])}}}P(-11,-12)
y + 12 = 3(x+11)
y = 3x + 21  
P(-7,0)  and (-5, 6) are two points on this Line.  Plot and connect with line

{{{drawing(300,300,   -10,10,-10,10,  
 grid(1),
circle(-5, 6,0.4),
circle(-7,0,0.4),
graph( 300, 300, -10,10,-10,10,0, 3x + 21 ))}}}
</PRE>