Question 306984
You can't graph a slope. 
You can graph a line.
Slope is change in y divided by change in x.
Easiest examples are those that go through (0,0).
Here's a line with a slope of 1.
{{{y=x}}}
{{{drawing(300,300,-5,5,-5,5,grid(1), graph( 300, 300, -5, 5, -5,5, x)) }}}
As you look at any point on the line and it's relationship to (0,0), you see
that the slope, m,
{{{m1=(2-0)/(2-0)=1}}}
.
.
.
Next we can graph {{{y=2x}}} where now for every step in x, you take two steps in the y direction. This makes a steeper curve. 
{{{drawing(300,300,-5,5,-5,5,grid(1), graph( 300, 300, -5, 5, -5,5, x,2x)) }}}
So when you look at points on the green line, say (2,4), then,
{{{m2=(4-0)/(2-0)=4/2=2}}}
Lines that are less steep than {{{y=x}}} have a coefficient in front of x that's less than 1. 
Let's graph {{{y=(1/4)x}}}
So now for every 4 steps in x, you'll take one step in y.
{{{drawing(300,300,-5,5,-5,5,grid(1), graph( 300, 300, -5, 5, -5,5, x,2x,x/4)) }}}
Lastly, negative slopes move downward as you go from right to left. 
Here's {{{y=-x/2}}} plotted with the rest. 
{{{drawing(300,300,-5,5,-5,5,grid(1), graph( 300, 300, -5, 5, -5,5, x,2x,x/4,-x/2)) }}}