Question 914986
{{{y = highlight_green(1)x + highlight(-2)}}}
the standard slope-intercept form for an equation of a line is 
{{{y = highlight_green(m)x + highlight(b)}}}  where m is the slope and b the y-intercept.   
m = 1. P(0,-2) on this Line
Find 2 points on Line:  P(0,-2) &   {{{m = 1/1}}}( Over 1, Up 1)   P(1,-1)
Plots Points, connect with a line
{{{drawing(300,300, -6,6,-6,6,
  grid(1),
  blue(circle(1,-1,.2)),
  circle(0,-2,.2),
 green(arc(1,-2+1/2,-1-1/2,-1,90,270)),
  blue(arc((1/2),-2,1,-1, 180,360)), 
graph(300, 300, -6,6,-6,6,0, x-2 ))}}}