Question 127071


Looking at {{{y=-x-2}}} we can see that the equation is in slope-intercept form {{{y=mx+b}}} where the slope is {{{m=-1}}} and the y-intercept is {{{b=-2}}} 



Since {{{b=-2}}} this tells us that the y-intercept is *[Tex \LARGE \left(0,-2\right)].Remember the y-intercept is the point where the graph intersects with the y-axis


So we have one point *[Tex \LARGE \left(0,-2\right)]


{{{drawing(500,500,-10,10,-10,10,
  grid(1),
  blue(circle(0,-2,.1)),
  blue(circle(0,-2,.12)),
  blue(circle(0,-2,.15))
)}}}



Now since the slope is comprised of the "rise" over the "run" this means

{{{slope=rise/run}}}


Also, because the slope is {{{-1}}}, this means:


{{{rise/run=-1/1}}}



which shows us that the rise is -1 and the run is 1. This means that to go from point to point, we can go down 1  and over 1




So starting at *[Tex \LARGE \left(0,-2\right)], go down 1 unit 

{{{drawing(500,500,-10,10,-10,10,
  grid(1),
  blue(circle(0,-2,.1)),
  blue(circle(0,-2,.12)),
  blue(circle(0,-2,.15)),
  blue(arc(0,-2+(-1/2),2,-1,90,270))
)}}}


and to the right 1 unit to get to the next point *[Tex \LARGE \left(1,-3\right)]

{{{drawing(500,500,-10,10,-10,10,
  grid(1),
  blue(circle(0,-2,.1)),
  blue(circle(0,-2,.12)),
  blue(circle(0,-2,.15)),
  blue(circle(1,-3,.15,1.5)),
  blue(circle(1,-3,.1,1.5)),
  blue(arc(0,-2+(-1/2),2,-1,90,270)),
  blue(arc((1/2),-3,1,2, 0,180))
)}}}



Now draw a line through these points to graph {{{y=-x-2}}}


{{{drawing(500,500,-10,10,-10,10,
  grid(1),
  graph(500,500,-10,10,-10,10,-x-2),
  blue(circle(0,-2,.1)),
  blue(circle(0,-2,.12)),
  blue(circle(0,-2,.15)),
  blue(circle(1,-3,.15,1.5)),
  blue(circle(1,-3,.1,1.5)),
  blue(arc(0,-2+(-1/2),2,-1,90,270)),
  blue(arc((1/2),-3,1,2, 0,180))
)}}} So this is the graph of {{{y=-x-2}}} through the points *[Tex \LARGE \left(0,-2\right)] and *[Tex \LARGE \left(1,-3\right)]