Respuesta :

Sierra0003
your friend has owned a cat for 17 years, because 9 times 2 subtracted by 1 equals 17

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:

[tex]9=2x-1[/tex]

Solving for [tex]x[/tex]:

[tex]9+1=2x\\x=\frac{10}{2}=5[/tex]

Therefore, he has owned a cat for 5 years.