NAME _____________________________________________DATE _____________________________ PERIOD _____________
8-1 Homework Practice
Function Tables
Complete each function table.
1.
Input (x)
0
3
7
x+6
Output (y)
2.
Input (x)
1
4
8
x –1
Output (y)
3.
Input (x)
0
2
4
3x + 2
Output (y)
4.
Input (x)
4
8
10
x ÷2
Output (y)
Find the input for each function table.
5.
Input (x)
x÷4
Output (y)
1
2
4
6.
Input (x)
x÷2
Output (y)
1
3
5
7.
Input (x)
x –3
Output (y)
0
2
3
5
8
8.
Input (x)
3x +3
Output (y)
3
6
9
12
15
9. FOODA pizza place sells pizzas for $7 each plus a $4 delivery chargeper order. If Pat orders 3 pizzas to be delivered,
what will be histotal cost?
10. MOVIESA store sells used DVDs for $8 each and used videotapes for$6 each. The function rule 8d + 6v can be used
to represent the totalselling price of DVDs d and videotapes v. Then use the function ruleto find the price of 5 DVDs
and 3 videotapes.
Course 1 • Chapter 8 Functions and Inequalities
115
NAME _____________________________________________DATE _____________________________ PERIOD _____________
8-1 Study Guide
Function Tables
A function rule, f(x),describes the relationship between the input and output of a function. The inputs andoutputs can
be organized in a function table.
Example 1
Complete the function table.
Input (x)
9
8
6
x–3
9–3
8–3
6–3
Output (y)
The f(x) isx - 3. Subtract 3 from each input.
Input
Output
9
–3 → 6
8
–3 → 5
6
–3 → 3
→
Input (x)
9
8
6
x –3
9–3
8–3
6–3
Output (y)
6
5
3
Example 2
Find the input for the function table.
Input (x)
4x
Output (y)
0
4
8
Dan is 17 years old. He is one third as old as
his mom.
How old
is histhe
mom?
Work
backward
to find
input. Since the rule is 4x, divide each output by 4.
The inputs are 0, 1, and 2.
Course 1 • Chapter 8 Functions and Inequalities
115