Math 8
Complete the table and graph each function.
1. y = 4x
x
2. y = –3x
y
4. y = 2x – 3
x
3.2 Practice. Graph using t-charts
x
3. y = x – 4
x
y
5. y = –3x + 1
y
x
Complete the table for the graphed function.
7.
8.
y
6. y = x – 4
x
y
9.
y
10. The table shows the apparent temperature P °F, as it feels to your body, as a function of the real air temperature A°F
when there is 10% humidity. Graph the function.
Air temperature (°F), A
70
75
80
85
90
95
Apparent temperature (°F), P
65
70
75
80
85
90
What is independent variable? __________________________
What is dependent variable? ___________________________
Rule of the function: P = ________________
11. The perimeter of an equilateral triangle equals 3 times the length of one side.
a. Write a function using two variables for this situation.
What is independent variable? __________________
Rule of the function:
What is dependent variable?
___________________
________________
b. Use the function to find the perimeter of equilateral triangle with sides 18 inches long.
12. The amount that Sunrise Library charges for an overdue book is $0.25 per day plus a $1 service charge.
As the amount of day you keep a book increases, the __________________ ___________________ .
What is independent variable? __________________
What is dependent variable?
___________________
Write a function using two variables for this situation.
Find the total charge of keeping a book that is overdue for 12 days.
13. Think of a gas pump with prices for regular and super gasoline. When the same amount of gas is being pumped into
a tank, how does the price per gallon affect the total cost of the gas? _____________________________________
______________________________________________________________________________________________
What is independent variable? __________________
8. Which graph will represent the equation y = x – 3?
What is dependent variable?
___________________