goal: identify and graph functions.. relation: mapping or pairing, of input values with output...
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SECTION 2-1: FUNCTIONS AND
THEIR GRAPHSGoal: Identify and graph
functions.
DEFINITIONS Relation: mapping or pairing, of input
values with output values.
Domain: Set of input values.
Range: set of output values.
Function: a relation is a function if each input value has exactly one output.
EXAMPLE 1: IDENTIFY FUNCTIONS
Identify the domain and range. Then tell whether the relation is a function. Explain.
CHECKPOINT: IDENTIFY FUNCTIONS
Identify the domain and range. Then tell whether the relation is a function. Explain.
EXAMPLE 2: APPLY THE VERTICAL LINE TEST Graph the relations from Ex. 1. Use the
vertical line test to tell whether the relation is a function.
CHECKPOINT: APPLY THE VERTICAL LINE TEST A. graph the relation shown in the diagram
below. B. Explain how to use the vertical line test to
show whether the relation is a function.
DEFINITIONS Equations in two variables: such as y = 5x
– 2; an ordered pair (x, y) is a solution of such an equation if substituting the values of x and y into the equation makes a true statement.
Independent variable: the input variable in an equation.
Dependent variable: the output variable.
EXAMPLE 3: GRAPH AN EQUATION Graph y = x + 1
CHECKPOINT: GRAPH AN EQUATION y = x - 3
CHECKPOINT: GRAPH AN EQUATION y = -x + 4
CHECKPOINT: GRAPH AN EQUATION y = 2x + 3
HOMEWORK:p. 70 – 72
14 – 46 even, 52-56
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