A school district has a reserve fund worth \(33.9\) million dollars. It plans to spend \(2.1\) million dollars per year. After how many years, will there be \(15\) million dollars left?
Assume there will be \(15\) million dollars left after \(y\) years. We can solve this problem using the equation:
Check whether \(9\) is a solution for \(y\) of this equation.