# Question #cb859

Jan 13, 2017

$y + y - 3 > 11$

or

$2 y - 3 > 11$

#### Explanation:

Let's parse the sentences in the question out one phrase at a time.

"her brother, who is y years old" can be written simply as $y$.

"Lauren is three years younger than her brother" - because we know her brother is $y$ we then know this phrase can be written as:

$y - 3$.

"The sum of their ages" means to add their two ages together:

$y + y - 3$

"is greater than" means simply $>$

or combining the terms so far:

$y + y - 3 >$

Finally, what is it greater than? It is greater than $11$ giving:

$y + y - 3 > 11$