(NP) Mixture problems - sometimes the context makes all the difference. Try these problems with mini M&Ms. This is a word document, ready to be revised and tweaked by you or use it as it is.
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(NP) Algebra Lab - the site is not flashy but there are a lot of good lessons that make connections to other curriculum, modeling, real world applications, graphing calculator lessons, and more. http://www.algebralab.org/directions.aspx

(NP) This is an amazing site for problems - Problem Attic - You pick the problems, it makes a worksheet and you can save or print them. The 9662 problems come from 241 past Regents exams in NY and problems are grouped by math topic. Easy to use. Just create a free login and password and you're ready to go! http://www.problem-attic.com/ Read an overview at http://blog.algebra1teachers.com/2012/11/problemattic.html

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[[#|step]]and multi-step equations http://www.uen.org/Lessonplan/preview.cgi?LPid=18867http://teacherleaders.wordpress.com/2014/05/03/introducing-systems-of-equations-graphing/