Rihanna was born in 1988. She is six years older than Justin Bieber. Create a algebraic expression to show what year Rihanna was double Biebers age.

Question

Cant just do it with logic. Must be an algebraic expression with a variable

Answer 1

Here's an equation.

y=the year Rihanna will be double Bieber's age

y-1988=2(y-1994)

y-1988=2y-3988

-1988=2y-y-3988

-1988=y-3988

3988-1988=y

2000=y

Rihanna was born in 1988 and Bieber was born in 1994

In 2000 Rihanna will be 12 and Bieber will be 6. (2000-1988=12 and 2000-1994=6)