To model the population of deer using an exponential growth equation, we can use the formula:
\[ y = P(1 + r)^x \]
where:
- \( y \) is the population after \( x \) years,
- \( P \) is the initial population,
- \( r \) is the growth rate (as a decimal),
- \( x \) is the number of years.
Given:
- The initial population \( P = 200 \),
- The growth rate \( r = 3% = 0.03 \).
Substituting these values into the equation, we have:
\[ y = 200(1 + 0.03)^x \]
Simplifying this, we get:
\[ y = 200(1.03)^x \]
Thus, the exponential equation that models the population of deer after \( x \) years is:
\[ y = 200(1.03)^x \]