Answer:
x + 6 = y or y - 6 = x
Explanation:
If you know that Cayden is 6 years older than Kaylee, then x (Kaylee's age) + 6 years = y (Cayden's age). You don't know the ages of them but you still know how much older Cayden is than Kaylee.
It can also be y - 6 = x because it shows that if you subtract 6 years from Cayden's age, you get Kaylee's age.
I don't know the options to this question but I hope this helps you :)