Question 871873
Already answered in another posting.  


See Number 2 in this posted solution:
<a href="http://www.algebra.com/algebra/homework/coordinate/word/Linear_Equations_And_Systems_Word_Problems.faq.question.871866.html">http://www.algebra.com/algebra/homework/coordinate/word/Linear_Equations_And_Systems_Word_Problems.faq.question.871866.html</a>