Question 123918
The first two points I would pick are the x and y intercepts.
For x=0,
{{{2x+3y=-6}}}
{{{2(0)+3y=-6}}}
{{{3y=-6}}}
{{{y=-2}}}
First point : (0,-2)
For y=0,
{{{2x+3y=-6}}}
{{{2x+3(0)=-6}}}
{{{2x=-6}}}
{{{x=-3}}}
Second point : (-3,0)
for the third point, let x=1,
{{{2(1)+3y=-6}}}
{{{2+3y=-6}}}
{{{3y=-8}}}
{{{y=-8/3}}}
Third point : (1,-8/3)
First step, plot the three points. 
{{{drawing( 300, 300, -5, 5, -5, 5,grid( 1 ),circle( -3,0, .2),circle( 1,-8/3, .2),circle( 0,-2, .2 ))}}}
Next step, draw the straight line connecting the three points.
{{{drawing( 300, 300, -5, 5, -5, 5,grid( 1 ),graph( 300, 300, -5, 5, -5, 5, (-6-2x)/3),circle( -3,0, .2),circle( 1,-8/3, .2),circle( 0,-2, .2 ))}}}