Information about 5 1 ext relations and functions

• If any input maps to more than one output, then it is not a function. • Is this a function? Why or why not?

YES! NO!

Tell if each represents a function: x y

Relations and functions can also be represented using: a set of ordered pairs a table a graph an equation

Is the relation a function? Remember: each input (x) can only have one unique output (y) {(0, 2), (1, 2), (3, 1), (4, 5)} {(-2, 4), (0, 3), (-2, 2), (-4, 1)} YES! NO!

Determine whether the relation is a function: {(2, 6), (3, 7), (4, 8), (3, 9)} {(1, -3), (0, -4), (-1, -3), (-2, -2)}

Is the relation a function? input -2 -1 0 0 1 2 output 3 4 5 6 7 8

Is the relation a function? input output 2 5 4 3 6 3

• A graph is a function if no vertical line crosses the graph at more than one point.

Determine whether each graph represents a function. YES! YES! NO!

Determine whether each graph represents a function.

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