In this question, it is given that
The population of a particular village can be modeled by the equation
where x is the number of years since 1990.
And we have to find in what year were there 1706 people living in the village?
So we put 1706 for y and solve for x. That is
Subtracting 56 from both sides.
And 1990 +15=2005
Therefore in 2005, there were 1706 people living in the village