Question

Amelie's cat is 6 years older than her dog. The sum of their ages is 14 years.    How old is Amelie's dog

Answer 1

C+d=14
c-6=d
then you will plug c+6 in the first equation and you will get:
c+c-6=14
then you get
2c=20
c=10, so the cat is ten years old
the cat is 6 years older than the dog, so the dog is 4 years old
hope that helps :)