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You use the value x for domain and y for range.when we say domain both x is 0 ex

x,y

(0,5) (0,2)

-both x is 0

x,y

(0,5) (0,2)

-both x is 0

Example:

f (x) = 2x + 3 Note: f(x) is y-value for the given x.

f (4) = 2 (4) + 3

f (4) = 8 + 3

f (4) = 11

This means that if x = 4, then y = 11

The corresponding y-values is the range (elements of real numbers)

If all domain and range are elements of real numbers, then:

Domain = {x/x is an ∈ of Real Numbers}

Domain = (-∞ , +∞)

Range = {y/y is an ∈ or Real Numbers}

Range = (-∞ , +∞)