Question

How do you determine the missing coordinate A (0, d), B(d, 0) if slope is undefined?

Answer 1

`d=0` results in undefined slope. If `d != 0` then slope is defined and is `-1`

Explanation:

If `d=0` then both points are `(0,0)` so the slope is indeterminate, so undefined.

If `d != 0` then slope `m` is defined by the formula:

`m = (Delta y)/(Delta x) = (0-d)/(d-0) = -1`