The value of xy is 114 which is a real number.
real numbers are all numbers/points that exist at the variety line.real numbers may be divided into the following divisions:Rational numbers; any range which may be written within the form ofin which p and q are co-prime integer numbers , are called rational numbers. Irrational numbers ; all numbers which cannot be written as a simple fraction is referred to as irrational numbers.
Given two real numbers x and y . Let us consider 
.
According to the question their sum is 25.
.............(i)
The difference of the numbers is 13.
...........(ii)
Now we have to solve the simultaneous equation:
adding equations (i) and (ii) we get:
Substituting the value x=19 into equation (i) we get:
Now let us find the product xy
The product xy is 114 which is also a real number.
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it is not a function because there are repeat x values. 3 shows up in two different coordinates as the x value.
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