The general equation to represent the enrollment of the school each year after 2000  = 1200 +35 n    
where n = number of years after 2000.
Step-by-step explanation:
Here, according to the question:
The initial number of students enrolled in the school = 1200 students
The number of students increased each year  = 35 students
Now if the initial year is 2000, then the number of student in the first year 
 = Initial enrollment  +  ( n  x Number of students increasing each year )
where n : The total number of years after 2000
So, the number of students in first year after 2000 for n = 1 is
1200 + ( 1 x 35)  = 1235
The number of students in second year after 2000 for n = 2  is
1200 + ( 2 x 35)  = 1270
The number of students in third year after 2000 for n = 3 is
1200 + ( 3 x 35)  = 1305
Hence, the general equation to represent the enrollment of the school each year after 2000  = 1200 +35 n    where n = number of years after 2000.