Question 1200271
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Your slope calculation is a bit off.


This is what it should be
{{{m = slope = rise/run = matrix(1,3,"change","in","y")/matrix(1,3,"change","in","x")}}}


{{{m = (y[2] - y[1])/(x[2] - x[1])}}}


{{{m = (-1 - 3)/(-6 - (-5))}}}


{{{m = (-1 - 3)/(-6 + 5)}}}


{{{m = (-4)/(-1)}}} Note the -1 in the denominator


{{{m = 4}}}
The slope is 4 aka 4/1.


A visual way to think of the slope: 
To move from (-6,-1) to (-5,3) we move 4 units up and 1 unit to the right
{{{
drawing(400,400,-7,2,-5,7,
graph(400,400,-7,2,-5,7,-1000,4*x+23),
grid(1),
red(circle(-6,-1,0.06)),
red(circle(-5,3,0.06)),
red(circle(-6,-1,0.08)),
red(circle(-5,3,0.08)),
red(circle(-6,-1,0.1)),
red(circle(-5,3,0.1)),
red(circle(-6,-1,0.12)),
red(circle(-5,3,0.12)),
red(circle(-6,-1,0.14)),
red(circle(-5,3,0.14)),
blue(arc(-6,-0.5,1,1,90,270)),
blue(arc(-6,0.5,1,1,90,270)),
blue(arc(-6,1.5,1,1,90,270)),
blue(arc(-6,2.5,1,1,90,270)),
blue(arc(-5.5,3,1,1,180,360))
)
}}}
slope = rise/run = 4/1
rise = 4 = go up 4 units
run = 1 = go to the right 1 unit


I'll let you finish up.
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