Price Is a relation a function?
function
a relation that assigns exactly one output value for each input value
relation
a set of pairs of input and output values
This relation is a function
(-1, 0) (0, 1) (1, 6) (2, 2)
This relation is a function
(-3, 0) (-1, 2) (0, 2) (2, 3)
This relation is not a function
(-5, 3) (-5, 2) (3, 7) (3, 8)
This relation is not a function
(0, 1) (0, -1) (2, 3) (-2, 3)
This relation is a function
(1, 2) (3, 4) (4, 5) (5, 2)
This relation is not a function
(1, 3) (2, 4) (2, 5) (3, 9)
if any vertical line crosses a graph in more than one point it is not a function (one x-value has more than one y-value)
What is the vertical line test?
If each number in the domain has an arrow to only one number in the range.
When does the mapping diagram represent a function?