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Elementary and Intermediate Algebra
Mark Dugopolski, Southeastern Louisiana University
Linear Equations in Two Variables and Their Graphs
Introduction to Functions

Warm-Ups



1

Any set of ordered pairs is a function.
A)TRUE
B)FALSE
2

The area of a square is a function of the length of a side.
A)TRUE
B)FALSE
3

The set {(-1, 3), (-3, 1), (-1, -3)} is a function.
A)TRUE
B)FALSE
4

The set {(1, 5), (3, 5), (7, 5)} is a function.
A)TRUE
B)FALSE
5

The domain of f (x) = x3 is the set of all real numbers.
A)TRUE
B)FALSE
6

The domain of y = | x | is the set of nonnegative real numbers.
A)TRUE
B)FALSE
7

The range of y = | x | is the set of all real numbers.
A)TRUE
B)FALSE
8

The set {(x, y) | x = 2y} is a function.
A)TRUE
B)FALSE
9

The set {(x, y) | x = y2} is a function.
A)TRUE
B)FALSE
10

If f (x) = x2 - 5, then f (-2) = -1.
A)TRUE
B)FALSE








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