Question 148020
I'll do the first one to get you started.





Looking at {{{y=-3x+7}}} we can see that the equation is in slope-intercept form {{{y=mx+b}}} where the slope is {{{m=-3}}} and the y-intercept is {{{b=7}}} 



Since {{{b=7}}} this tells us that the y-intercept is *[Tex \LARGE \left(0,7\right)].Remember the y-intercept is the point where the graph intersects with the y-axis


So we have one point *[Tex \LARGE \left(0,7\right)]


{{{drawing(500,500,-10,10,-10,10,
  grid(1),
  blue(circle(0,7,.1)),
  blue(circle(0,7,.12)),
  blue(circle(0,7,.15))
)}}}



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

{{{slope=rise/run}}}


Also, because the slope is {{{-3}}}, this means:


{{{rise/run=-3/1}}}



which shows us that the rise is -3 and the run is 1. This means that to go from point to point, we can go down 3  and over 1




So starting at *[Tex \LARGE \left(0,7\right)], go down 3 units 

{{{drawing(500,500,-10,10,-10,10,
  grid(1),
  blue(circle(0,7,.1)),
  blue(circle(0,7,.12)),
  blue(circle(0,7,.15)),
  blue(arc(0,7+(-3/2),2,-3,90,270))
)}}}


and to the right 1 unit to get to the next point *[Tex \LARGE \left(1,4\right)]

{{{drawing(500,500,-10,10,-10,10,
  grid(1),
  blue(circle(0,7,.1)),
  blue(circle(0,7,.12)),
  blue(circle(0,7,.15)),
  blue(circle(1,4,.15,1.5)),
  blue(circle(1,4,.1,1.5)),
  blue(arc(0,7+(-3/2),2,-3,90,270)),
  blue(arc((1/2),4,1,2, 0,180))
)}}}



Now draw a line through these points to graph {{{y=-3x+7}}}


{{{drawing(500,500,-10,10,-10,10,
  grid(1),
  graph(500,500,-10,10,-10,10,-3x+7),
  blue(circle(0,7,.1)),
  blue(circle(0,7,.12)),
  blue(circle(0,7,.15)),
  blue(circle(1,4,.15,1.5)),
  blue(circle(1,4,.1,1.5)),
  blue(arc(0,7+(-3/2),2,-3,90,270)),
  blue(arc((1/2),4,1,2, 0,180))
)}}} So this is the graph of {{{y=-3x+7}}} through the points *[Tex \LARGE \left(0,7\right)] and *[Tex \LARGE \left(1,4\right)]