=> Let the age of Hema  Mery is x year and Mary's age is y years

=> Then as per given Hema's age is 4 times the age of Mary

=> Hence, x = 4y

=> Or x − 4y = 0

I hope this will help you dear..

Always stay safe and stay healthy..

Step-by-step explanation:

Let hema's age be x.

Let hema's age be x.Let Mary's age be y.

Let hema's age be x.Let Mary's age be y.x=4y