Beginning Algebra, 11th Edition

238 CHAPTER 3 Linear Equations and Inequalities in Two Variables; Functions

3.1

line graph
linear equation in two
variables
ordered pair
table of values
x-axis
y-axis
origin
rectangular (Cartesian)
coordinate system

quadrant

plane

coordinates

plot

scatter diagram

3.2

graph, graphing

y-intercept

x-intercept

horizontal line

vertical line

3.3

rise

run

slope

subscript notation

parallel lines

perpendicular lines

3.5

linear inequality in two

variables

boundary line

3.6

components

relation

domain

range

function

function notation

KEY TERMS

1 a,b 2 an ordered pair m slope x-sub-one,
y-sub-one

1 x 1 ,y 12 ƒ 1 x 2 functionƒofx

NEW SYMBOLS

SUMMARY

CHAPTER 3

1.Anordered pairis a pair of
numbers written
A.in numerical order between
brackets
B.between parentheses or brackets
C.between parentheses in which
order is important
D.between parentheses in which
order does not matter.

2.Aninterceptis
A.the point where the x-axis and
y-axis intersect
B.a pair of numbers written in
parentheses in which order
matters
C.one of the four regions
determined by a rectangular
coordinate system

D.the point where a graph intersects

thex-axis or the y-axis.

3.Theslopeof a line is

A.the measure of the run over the

rise of the line

B.the distance between two points

on the line

C.the ratio of the change in yto the

change in xalong the line

D.the horizontal change compared

with the vertical change of two

points on the line.

4.Two lines in a plane are parallelif

A.they represent the same line

B.they never intersect

C.they intersect at a 90° angle

D.one has a positive slope and one

has a negative slope.

5.Two lines in a plane are

perpendicularif

A.they represent the same line

B.they never intersect

C.they intersect at a 90° angle

D.one has a positive slope and one

has a negative slope.

6.Afunctionis

A.any set of ordered pairs

B.a set of ordered pairs in which

each first component

corresponds to exactly one

second component

C.two sets of ordered pairs that are

related

D.a graph of ordered pairs.

TEST YOUR WORD POWER

See how well you have learned the vocabulary in this chapter.

ANSWERS
1.C;Examples: 2.D;Example:The graph of the equation has x-intercept and y-intercept
3.C;Example:The line through and has slope 4.B;Example:SeeFIGURE 27inSection 3.3.
5.C;Example:SeeFIGURE 28inSection 3.3. 6.B;Example:The set of ordered pairs is a function, since
eachx-value corresponds to exactly one y-value.

51 0, 2 2 , 1 2, 4 2 , 1 3, 6 26

4 - 6

5 - 3 =

• 2
  1 3, 6 2 1 5, 4 2 2 =-1.

1 0, 3 2 , 1 - 3, 8 2 , 1 4, 0 2 4 x- 3 y= 12 1 3, 0 2 1 0,- 42.

http://www.ebook777.com

http://www.ebook777.com