Hey there :)
y =

Since this line is parallel to the line to be found, both have the same slope:

Coordinates: ( - 9 , - 2 )
y - ( -2 ) =

( x - ( -9 ) )


Answer:
Is it a map? To me that makes the most logical sense.
This is an arith. sequence, and the common difference is -9.
a(n+1) = a(n)-9, with a(1)=8. Thus, if we look at the first term, we see 8; subracting 9 from 8 produces the second term (-1).