a relation in which each input is paired with exactly one output

a visual inspection for checking whether or not a graph represents a function

the variable for which input values are substituted in a function.

the variable whose value is determined by the input or value of the independent variable.

the points in the graph are connected, indicating that domain and range are sets of real numbers with no breaks in between.

data consists of individual points that are not connected by a line or curve.

the point where a line crosses the y-axis. Its coordinates will be of the form (0,a), where a is a real number.

the greatest value of f(x) for values in a limited open domain interval.

all maximum and minimum values.

the least value of f(x) for values in a limited open domain interval.

the point where a line crosses the x-axis. Its coordinates will be of the form (a,0), where a is a real number.

the most basic function of a particular type, such as f(x) = x (linear); f(x) = x 2 (quadratic); f(x) = |x| (absolute value); f(x) = b x (exponential).

the distance from a number, n, to zero on a number line,

written |n|.