Question

Kathy is eight years younger than her sister Mary. If Mary is m years old, which expression describes Kathy's age?

Answer 1

Anytime we get younger, we go down in age, or subtract years. So if Kathy is 8 years younger than Mary, we have to subtract 8 years from Mary's age.
M=Mary's age, K=Kathy's age
M-8=K

Answer 2

thank you

Answer 3

No problem!! =)