Question 828391
(0,-8), (1,-7), (2,-6), (3,-5), (4,-4)
<pre>
(0,-8),  we observe that (-8)-(0) = -8
(1,-7),  we observe that (-7)-(1) = -8
(2,-6),  we observe that (-6)-(2) = -8
(3,-5),  we observe that (-5)-(3) = -8
(4,-4),  we observe that (-4)-(4) = -8

We therefore conclude that if we had (x,y),
we would observe that 

y-x = -8

  y = x-8

That's the rule.

Edwin</pre>