Writing the Rule
for Functions
1
Complete the table.
x
y 1
3 2 9 3 15 4 21 5 6 Based on the function table, write a function rule that shows
the relationship between x and y.
2
Luisa works in her grandfather's jewelry shop. She deposits
her earnings in a savings account. Her savings account
balance for the 5 of her last 6 weeks are shown in the function table below.
Week (w)
Savings Balance (b)
1
$510
2 $620
3 $730
4 $840
5 6 $1,060 A. Write a function rule that shows how much money Luisa
saves each week.
B. How much money is in Luisa's account in week 5?
3
33.
Complete the table
x
y 1
3 2 7
3 11
4 15 5 6 Write a function rule that shows the relationship between x and y.
4
The table shows the number of chaperones, y, needed for a certain number of students, x, at a school dance.
Number of Students (x) 32 48 64 96 Number of Chaperones (y) 4 6 8 12 Write an equation that represents the relationship between the
number of chaperones needed and the number of students
attending a dance.
How many chaperones will be needed for a dance that has 240 students?
5
The table below shows Jeffrey's bank account balance
for the past six weeks.
Week (w)
Balance (b) 1
$10
2 $24
3 $38
4 $52
5 $66 6 $80 Write an equation that represents the balance, b, in Jeffrey's bank account as a function of the number of weeks, w.
Find what Jeffrey's bank account balance will be in Week 8.
6
Carlotta conducted an experiment on the growth rate of bacteria. The table shows her results
Number of Hours (h) Number of Bacteria (b) 0 20 1 56 2 92 3 128 Write a function rule for the number of bacteria, b, after h hours.
What will the number of bacteria be after 5 hours?
7