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Here is how I would attack this problem...  

We know the slope is down  (from left to right), so it must be NEGATIVE

p = the X   horizontal

r = the Y  vertical

In the picture, the X is bigger than the Y

Slope is    Y/X

Plug in some numbers, any numbers

Y                     -1
___             ______

X                      4

see below...  

So let’s guess that X = 4  and Y =  1

maybe -4, 1        and   4, -1