Aculture started with 2000 bacteria after 6 hours it grew to 2400 bacteria how many bacteria will grow after 16 hours

Started at 2000after 6 hrs it grew to 2400...that means in 6 hrs, it grew 400.
6/400 = 16/x 6 hrs to 400 = 16 hrs to x
this is a proportion, so we cross multiply
(6)(x) = (400)(16)
6x = 6400
x = 6400/6
x = 1066.67 <==

I’m pretty sure the slope would be 1 since the x and y values increase by 1