Yes. In fact, all the elements of an infinitely large domain can have the same value from the range set. The horizontal line,
y = 3 for all real x,
is an example of this extreme case.
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Domain is the spectrum of values on the x-axis. Domain will be which x-values can be plugged into that equation and give an answer. Range is the same thing, but y-values. On the graph it will be the y-values that are included in the graph.
The domain of a function represents the set of x values and the range represents the set of y values. Since y=x, the domain is the same as the range. In this case, they both are the set of all real numbers.
A relation is a mapping between two sets, a domain and a range. A function is a relationship which allocates, to each element of the domain, exactly one element of the range although several elements of the domain may be mapped to the same element in the range.
The range may increase or decrease with the domain or it may remain the same.
Domain is greater than or equal to zero. same with range