what is the range of the relation below?

Question

((1,2)(3,4)(5,6)(7,8))
a)all real numbers
b) all even numbers
c)(2,4,6,8)
d)(1,3,5,7)
I am confused because I thought the range was the highest - the lowest number.
so if it was the highest 8-1, the lowest, the answer would be 7.
if you do each set separately each answer is 1
either way I would say a) they are all real numbers.
Is this correct? If not could you lead me in the correct direction of what to do. Thanks

Answer 1

Rang : {2, 4,6,8}
Ans C

Answer 2

The range by definition is a set that contains all the y values .

Answer 3

ok, so the first number is the x value and the second is the y value?
Thank you for explaining that.

Answer 4

Yes first number is x value and second number is y value.