A town's population has been growing linearly. In 2003 the population was 63,000 . The population has been growing by 1700 people each year.

Write an equation for the population, P, $x$ years after 2003.
$$P=$$
Use the formula to find the population in 2009:

Step 1 ：The population growth is linear, which means it can be represented by the equation of a straight line, y = mx + c, where m is the slope (rate of growth) and c is the y-intercept (initial population). In this case, the slope is 1700 (the number of people the population grows by each year) and the y-intercept is 63,000 (the population in 2003). The variable x represents the number of years after 2003.

Step 2 ：To find the population in 2009, we need to substitute x = 2009 - 2003 = 6 into the equation.

Step 3 ：$P=1700x+63000$

Step 4 ：$P=1700\ast 6+63000$

Step 5 ：$P=10200+63000$

Step 6 ：$P=73200$

Step 7 ：Final Answer: The equation for the population, P, $x$ years after 2003 is $P=1700x+63000$. The population in 2009 was $\boxed{{\displaystyle 73200}}$.