Question 201047
Simply plot an open circle at x=-1 and draw a shaded arrow to the left like so:


{{{drawing(500,80,-11, 9,-10, 10,
number_line( 500, -11, 9),


arrow(-1,0,-11,0),
arrow(-1,0.30,-11,0.30),
arrow(-1,0.15,-11,0.15),
arrow(-1,-0.15,-11,-0.15),
arrow(-1,-0.30,-11,-0.30),




circle(-1,0,0.3),
circle(-1,0,0.3),
circle(-1,0,0.3),
circle(-1,0,0.3-0.02)
)}}}