Question

Alfred is y years old

Libby is 4 years younger
than Alfred.

John is 4 times as old as
Libby.

Write down an expression in terms of y, for john’s age.

Answer 1

therefore, the expression for John's age in terms of y is 4y - 16.

Explanation:

Answer 2

John's age = 4y - 16

Explanation:

We can start by using the information given to write expressions for the ages of Libby and John in terms of Alfred's age y.

We know that Libby is 4 years younger than Alfred, so her age can be written as:

Libby's age = Alfred's age - 4

We also know that John is 4 times as old as Libby, so his age can be written as:

John's age = 4 × Libby's age

Substituting the expression for Libby's age from the first equation into the second equation, we get:

John's age = 4 × (Alfred's age - 4)

Simplifying this expression, we get:

John's age = 4 × Alfred's age - 16

Therefore, an expression in terms of y for John's age is:

John's age = 4y - 16