Sewanhaka High School
Math 8
Class:______________
Mrs. Lidowsky, Principal
Mr. Long, Teacher
Date:________________________
Name:__________________
H.W. #31: Ditto
DO-NOW #31: Answer the following questions:
1) 1) List the relation represented by the table below, which shows the number of miles Mr. Shorty has driven at
different hours as ordered pairs. Identify the domain and range of the relationship. Represent the relationship as a
mapping diagram. Is the relation a function? Explain.
Domain:
Hours
1
2
3
4
5
Miles
60 100 160 210 270 Range:
DOMAIN (input)
RANGE (output)
2) If -4 was added to the product of -2 and +3, what would the result be?
3) What is the quotient of -40 and -8?
4) Find the value of (-4)2 =
Topic: Functions
Main Idea: Function Notation
Aim:
RECALL
List the ordered pairs where the second number
(y) is 4 more than the first number (x).
Write the equation in terms of y.
Let f(x) = x + 4. Find f(x) when x = 5.
Let f(x) = -x + 6. Find f(x) when x = 5.
Let f(x) = -3x + 8. Find f(x) when x = -5.
Let g(x) = 4x – 5. Find g(2). Find g(-10).
What if f(x) = 7x + 4 and the value of f(x) = 67?
How could you find x?
What if f(x) = 10x - 8 and the value of f(x) = -18?
How could you find x?
NOTES
Drill: Answer the following questions. Show work.
1) Let f(x) = 10x – 8.
2) Let h(x) = -7x + 10.
Find f(x) when x = 3.
Find h(x) when x = 0.
Summary:
3) Let f(x) = 4x + 1. Find
f(x) when x = 2.
4) Let g(x) = 4x – 5.
Find x when g(x) = 19.