Question

In y years, Alex will be three times the age of his sister Nancy. Currently, Alex is a years old and Nancy is n years old. what expression would be equal to y ?
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Answer 1

Answer:

Alex's age = a

Nancy's age = n

Alex's age in y years = a + y

Also, Alex's age in y years = 3n

So, 3n = a+y

Answer 2

Answer:

Step-by-step explanation:

Alex age currently=1

Nancy age currently=n

Alex age in y years= 1+y=y

Nancy age in y years=n+y

Alex age in y years = 3(nancy age in y years)

y=3(n+y)

y=3n+3y

-3n=3y-y

-3n=2y

y=-3n/2

The reason the age is in negative is because Nancy hasn't been born yet :)