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Answer 1 · 2017-01-13T14:09:22

$y + y - 3 > 11$

or

$2y - 3 > 11$

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:

$y + y - 3 > 11$