Question

Variables A and B are inversely related.
If we plot A on the horizontal axis and B on the vertical axis, the line that connects combinations of A and B in a two variable diagram is?

downward sloping (left to right).
upward sloping (left to right).
parallel to the vertical axis.

Answer 1

I'd have to say the first one

Answer 2

You are correct, but why?

Answer 3

because if you drew a line downward from the vertical line to the horizontal line, it would be from left to right. If you drew a line upward from the horizontal line to the vertical line, then it would have to be from right to left. Lucky guess. Am I right