Question 176819
The slope on a graph has exactly the same definition as
the slope of a roof. It is rise over run. For the slope of
a roof, you measure how high the roof is and divide by 
the distance from the peak to the eaves, or the gutter
On a graph, the formula for this is 
{{{(y[2] - y[1]) / (x[2] - x[1])}}}
where the given points are (x1,y1) and (x2,y2)
If the equation of the line is in this form:
{{{y = mx + b}}}, then {{{m}}}= slope
For instance,
{{{y = (2/3)*x + 17}}}
The slope is {{{2/3}}}
Any line parallel to this one will also
have a slope  = {{{2/3}}}
And to measure this slope, you would start at some point on
the line, say (0,17) which is the y-intercept, go up
2 units and see how far you went horizontally. It 
should be 3 units. That's the rise over run as in a
roof.