Exponential Functions and
The exponential function f with base a is
f(x) = ax
where a > 0, a 1, and x is any real number.
f(x) = 3x and g(x) = 0.5x
are exponential functions.
The value of f(x) = 3x wh
An Introduction to
A relation is a rule of correspondence that
relates two sets.
For instance, the formula I = 500r describes a
relation between the amount of interest I
earned in one year and the interest rate r.
Graphs of Equations
The graph of an equation in two variables x and y
is the set of all points (x, y) whose coordinates
satisfy the equation.
For instance, the point (1, 3) is on the graph of
2y x = 7 because the equation is satisfied when