A town's population has been growing linearly. In 2003, the population was 25000, and the population has been growing by 1200 people each year. Write an equation for the population

x

years after 2003.

In year 2003 (starting year) it had 25000 pple

let's say a=25000

so steadily each year it increases by 1200

which means the difference between two consecutive years would be 1200 pple

now this is an arithmetic progression

using Tx=a + (x-1) 1200

tx = 25000 + (x-1) 1200

tx=25000+1200x-1200

tx = 23800+1200x

that's the eqn after X years

Y=25000*1200x

y would equal the population of the year and x is the amount of years passed.