Question

this isn't a function is it?
click to see drawing

Answer 1

it is not a function

Answer 2

that would be a function, correct?

Answer 3

#2 it is a function

Answer 4

what would the definition of a function be? a line that leaves it's quadrant into the positive?

Answer 5

that is also not parallel with x or y?

Answer 6

Easy test for a function when you have it graphed. Think of a vertical line scanning it from left to right. If it intersects more than 1 point, it's not a function.