Unit 5 - Linear Equations,
Inequalities and Systems of Linear
Equations in Two Variables
Module 5B
Sections 15.1, 15.3
–
15.5

5B
Functions and Graphs
Given a function described by an equation, find function values
(outputs) for specified values (inputs).
2
The
inputs
are values of
x
substituted into the equation
and are called members of the domain.
The
outputs
are the resulting values of
y
and are called
members of the range .
If we call the function
f,
we can use
x
to represent an
arbitrary
input
and
f
(
x
)
—read “
f
of
x
,” or “
f
at
x
,” or “the
value of
f
at
x
”—
to represent the corresponding
output.

5B
Functions and Graphs
Given a function described by an equation, find function values
f(x)
(outputs) for specified values of
x
(inputs).
Find each of the indicated function values.
3

5B
Functions and Graphs
Given a function described by an equation, find function
values
f(x)
(outputs) for specified values of
x
(inputs).
4
One way to find function values when a formula is given
is to think of the formula with blanks, or placeholders,
replacing the variable as follows:

5B
Functions and Graphs
Given a function described by an equation, find function
values (outputs) for specified values (inputs).
5
S
UBSTITUTE
0
FOR EACH
X
S
UBSTITUTE
1
FOR EACH
X
S
UBSTITUTE
-5
FOR EACH
X
S
UBSTITUTE
7a
FOR EACH
X

5B
Functions and Graphs
Given a function described by an equation, find function values
(outputs) for specified values (inputs).
Find the indicated function value.
6