Find the domain and range of the relation and determine if it's a function or not.

https://dl.dropboxusercontent.com/u/19479041/School/478541-5232012-123004-PM-386420606.png

Answers:
domain x 1; Range y 1; Yes it's a function
domain: all real numbers; range: all real numbers ; Yes it's a function
Domain: positive integers Range: positive integers; No it's not a function
Domain x = 0; Range y = 1; No it's not a function

Question

Find the domain and range of the relation and determine if it's a function or not.

https://dl.dropboxusercontent.com/u/19479041/School/478541-5232012-123004-PM-386420606.png

Answers:
domain x > 1; Range y > 1; Yes it's a function
domain: all real numbers; range: all real numbers ; Yes it's a function
Domain: positive integers Range: positive integers; No it's not a function 
Domain x >= 0; Range y >= 1; No it's not a function

oaktree · Answer

So we can eliminate the last two options because we know that the graph shows a function, right? Since we don't have any "overlaps" when we do the vertical line test. Following so far?

anonymous · Answer

Yes I knew that the last two weren't true.

oaktree · Answer

Okay. Now the next step is easy. We know that the domain and range can't be all real numbers, because the graph is limited to a particular region of the Cartesian plane. It doesn't even go outside the first quadrant! So we know that the answer is answer choice a.

anonymous · Answer

Thank you so much! That was what I thought I was just making sure.

oaktree · Answer

Great. Glad to help.