chapter 3

Question 1

relation

Answer 1

a description of how 2 variables are connected

Question 2

independent variable

Answer 2

in a relation it’s the variable whose value you chose; usually placed in the left column in a table of values and the horizontal (x) axis on a graph

Question 3

dependent variable

Answer 3

in a relation it’s the variable whose value you calculate; usually place in the right column in a table of values and the vertical (y) axis on a graph

Question 4

direct variation

Answer 4

a relation where one variable is a multiple of the other

Question 5

partial variation

Answer 5

a relation where one variable is a multiple of the other plus/minus a constant amount

Question 6

linear relation

Answer 6

a relation in which the graph forms a straight line

Question 7

non-linear relation

Answer 7

a relation in which the graph does not form a straight line

Question 8

rate of change

Answer 8

the change in one variable relative to the change in another

Question 9

slope

Answer 9

a measure of the steepness of a line, it’s the ratio comparing the vertical and horizontal distance (rise and run) between to points (the m in y=mx+b, m=rise/run)

Question 10

first difference

Answer 10

the difference between 2 consecutive y-values in a table (x-values constant)

Question 11

discrete

Answer 11

a set of data that cannot be broken into smaller parts, dotted line

Question 12

continuous

Answer 12

a set of data that can be broken down into smaller and smaller parts and still have meaning, continuous line

Question 13

interpolate

Answer 13

estimate a value between 2 known values

Question 14

extrapolate

Answer 14

estimate a value outside of the known values

Question 15

y-intercept

Answer 15

the value of the dependent variable when the independent variable (x) value is 0, sometimes called the initial value

Question 16

x-intercept

Answer 16

the value of the independent variable when the dependent variable (y) value is 0