Question 770222
Looking at {{{y=(2/5)x-4}}} we can see that the equation is in slope-intercept form {{{y=mx+b}}} where the slope is {{{m=2/5}}} and the y-intercept is {{{b=-4}}} 



Since {{{b=-4}}} this tells us that the y-intercept is *[Tex \LARGE \left(0,-4\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,-4\right)]


{{{drawing(500,500,-10,10,-10,10,
  grid(1),
  blue(circle(0,-4,.1)),
  blue(circle(0,-4,.12)),
  blue(circle(0,-4,.15))
)}}}



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

{{{slope=rise/run}}}


Also, because the slope is {{{2/5}}}, this means:


{{{rise/run=2/5}}}



which shows us that the rise is 2 and the run is 5. This means that to go from point to point, we can go up 2  and over 5




So starting at *[Tex \LARGE \left(0,-4\right)], go up 2 units 

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


and to the right 5 units to get to the next point *[Tex \LARGE \left(5,-2\right)]

{{{drawing(500,500,-10,10,-10,10,
  grid(1),
  blue(circle(0,-4,.1)),
  blue(circle(0,-4,.12)),
  blue(circle(0,-4,.15)),
  blue(circle(5,-2,.15,1.5)),
  blue(circle(5,-2,.1,1.5)),
  blue(arc(0,-4+(2/2),2,2,90,270)),
  blue(arc((5/2),-2,5,2, 180,360))
)}}}



Now draw a line through these points to graph {{{y=(2/5)x-4}}}


{{{drawing(500,500,-10,10,-10,10,
  grid(1),
  graph(500,500,-10,10,-10,10,0,(2/5)x-4),
  blue(circle(0,-4,.1)),
  blue(circle(0,-4,.12)),
  blue(circle(0,-4,.15)),
  blue(circle(5,-2,.15,1.5)),
  blue(circle(5,-2,.1,1.5)),
  blue(arc(0,-4+(2/2),2,2,90,270)),
  blue(arc((5/2),-2,5,2, 180,360))
)}}} So this is the graph of {{{y=(2/5)x-4}}} through the points *[Tex \LARGE \left(0,-4\right)] and *[Tex \LARGE \left(5,-2\right)]