Answer:
He has owned a cat for 5 years.
Step-by-step explanation:
He has owned a dog for 9 years, and this time is one year less than twice as long as he has owned a cat.
So, we can express this like:
\(9=2x-1\)
Solving for \(x\):
\(9+1=2x\\x=\frac{10}{2}=5\)
Therefore, he has owned a cat for 5 years.
