Chapter 5 - Section 5.1 - Systems of Linear Equations - 5.1 Exercises - Page 486: 2

$\text{approximately }1.25\text{ million}$

The equal population is between year $2005$ and $2006$. Get the average of $1.2$ million and $1.3$ million to obtain: $=\dfrac{1.2+1.3}{2}=1.25$ Thus, in the population is around $1.25$ million.