The first number in each ordered pair is the x-value and the second number is the corresponding y-value.
Domain: { 3} Range: {-2, 1, 4, 7, 8 } Is It a Function? No
Practice makes perfect
Consider the given relation.
{(3,7), (3,8), (3,-2), (3,4), (3,1)}The domain of this relation is the set of all unique x-values and the range is the set of all unique y-values.
Domain:& { 3}
Range:& {-2, 1, 4, 7, 8 }
To show a relation of (x,y) ordered pairs as a mapping, list all of the unique x-values in one vertical list and all unique y-values in another vertical list. Then, use arrows to connect corresponding x- and y-values.
Because the domain value 3 is mapped to more than one of the range values, this relation is not a function.
