The function is .
The points are and
.
The instantaneous rate of change of the graph of at the point
is the slope
of the tangent line at
given by
, provided the limit exists.
The slope at the point is
.
.
The slope of the function at
is
.
The slope at the point is
.
The slope of the function at
is
.
The slope of the function at
is
.
The slope of the function at
is
.