Question 936900
Find two points.
Plot them and connect them with a straight line.
When {{{x=0}}},
{{{y=(1/2)(0)-1}}}
{{{y=-1}}}
(0,-1)
When {{{x=2}}},
{{{y=(1/2)(2)-1}}}
{{{y=1-1}}}
{{{y=0}}}
(2,0)
.
.

{{{drawing(300,300,-5,5,-5,5,grid(1),circle(0,-1,0.2), circle(2,0,0.2))}}}
.
.
{{{drawing(300,300,-5,5,-5,5,grid(1),circle(0,-1,0.2), circle(2,0,0.2),graph(300,300,-5,5,-5,5,(1/2)x-1))}}}