Question 328010
Let x = the number
2x= the number doubled


x+ 2x = 3x


This comes out to 3x=3x, which is ALWAYS TRUE!!  In other words, it doesn't matter what the number is, this will work.  In math we call this an IDENTITY!!


For additional help on WORD PROBLEMS, please see my own website for a LOT of FREE resources.  However, I don't have any identities on this page!!  Nevertheless, it may help to find help with word problems in general to click on my tutorname "rapaljer" anywhere in algebra.com.  Once you find my Homepage, look for "Basic, Intermediate, and College Algebra: One Step at a Time".  There you will find my own user-friendly explanation for just about all the topics in algebra.  Choose "Basic Algebra", then look in "Chapter 1" for "Sections 1.09 and 1.10".


Many of my exercises in this section are solved in the "MATH IN LIVING COLOR" sections that go with this.  There you will find an explanation that will probably be a lot easier to understand than your own expensive textbooks!!  My materials are all free.


Dr. Robert J. Rapalje, Retired
Seminole State College of Florida
Altamonte Springs Campus