Recall that the slope of a non-vertical line is a measure of the number of units the line rises (or falls) vertically for each unit of horizontal change from left to right. Thus, the slope of a line passing through
P(2, 4)
and
Q(x, f(x))
is given by
Slope = m =
f(x) − 4
x − 2
P(2, 4)
and
Q(x, f(x))
is given by
Slope = m =
f(x) − 4
x − 2