Question 15349
I'll just BET that this question was raised by one of MY own students, with reference to #17 on page 329 of my College Algebra: One Step at a Time!!!  Am I right???  Congratulations on a GREAT question, and thanks to Kenny for a great answer.  "Invertible" steps!  That's what you call it. 


R^2 at Seminole Community College
Sanford, Florida