# Math 8 Lesson Plan 33 Determining if a relation is a function on a graph class outline for students.doc ```Sewanhaka High School
Math 8
Per:________________
Name:________________________________
Mrs. Lidowsky, Principal
Mr. Long, Teacher
Date:_____________________
H.W. #33: Ditto
DO-NOW #33: Answer the following questions:
1) Write the rule for the following function: The second number is six less than twice the first number. What pairs
of numbers am I thinking of. Graph the previous function using a table of values.
Input (
)
[Domain]
Rule:
Output (f(
[Range]
))
2) Andrew can walk 4 miles in 20 minutes. How long
will it take (in minutes) him to walk 6 miles?
Topic: Functions
Main Idea: Vertical Line Test
Aim:
RECALL
List the ordered pairs where the
second number (y) is 1 more than
the first number (x)
Write the equation in terms of y.
Graph the line. Is this relation a
function?
NOTES
Represent the relation as a graph. Then tell whether the
relation is a function. Explain your reasoning.
(-1, 1), (2, 0), (3, 1), (3, 2), (4, 5)
Drill: Represent each relation as a graph. Then tell whether the relation is a function. Explain your reasoning.
1) (0, 3), (1, 2), (2, -1), (4, 4), (5, 4)
2)
(-2, -1), (0, 2), (2, 3), (-2, -4)
f(x)
Summary:
(3) The graph at the left represents f(x). Find the following values:
(a) f(-4) = _____
(b) f(-2) = ______
(c) f(0) = _____
(d) f(1) = ______
(e) f(2) = _______
(f) f(4) = _____