Question 489409
<pre>

y= -|3x+4|

The vertex is when what's between the absolute value bars = 0.
                                         3x+4 = 0
                                           3x = -4
                                            x = {{{-4/3}}}
                
The two equations are

y = -(3x+4)  for x &#8807; {{{-4/3}}}  and  y = -(-3x+4) or y = 3x-4 for x < {{{-4/3}}}

The vertex is the point ({{{-4/3}}},0) 

Get a point on each side of the vertex.

 x |  y
-2 | -2
{{{-4/3}}} | 0
 0 | -4 

{{{drawing(400,400,-6,5,-8,3,
circle(-2,-2,.1), circle(-4/3,0,.1), circle(0,-4,.1),
graph(400,400,-6,5,-8,3,-abs(3x+4)))}}}

Edwin</pre>