so what you have is this:
y = -65x + 1000
this is a form of [tex]y = mx + b[/tex],
where [tex]m[/tex] is the slope and [tex]b[/tex] is the y-intercept of the linear relationship.
so, -65 is [tex]m[/tex] and 1000 is the [tex]b[/tex]
It should be a piece of cake from there :D