For households in a community, many different variables can be observed or measured. If y = monthly

Question:

For households in a community, many different variables can be observed or measured. If y = monthly mortgage payment, x = annual income would probably be directly related to y. For y = monthly mortgage payment, provide an example of an x variable likely to be
(a) Directly related to y,
(b) Inversely related to y, and
(c) Unrelated to y.