Question

Which relations are functions?


Select Function or Not a function for each graph.

Answer 1

Answer: Choice B and Choice D

Step-by-step explanation

If it is ever possible to draw a single vertical line through more than one point on the curve, then that curve is not a function. This is because a function must have any x input lead to exactly one y output.

Choices A and C are not functions for this reason. They fail the vertical line test. Choices B and D pass the vertical line test.