Answer:
value preferred stock for $65,250 cash
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If you know that
, then you know right away

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Otherwise, you can derive the same result. Let
, so that
.
is bounded, so we know
. For these values of
, we always have
.
So, recalling the Pythagorean theorem, we find

Then

as expected.
The formula of a slope:

We have the points (-8, -20) and (5, 2). Substitute:

Answer: The slope is 
Yes the x values are all different, if two were the same then it would not be one but in this case it is