xyAlgebra: Intelligent, Interactive Practice
  or Instruction in Algebra and Verbal Problems

The student programs (xyAlgebra and xySolver) feature:

• Explanations of principles of basic algebra (350 instructional items).
• Step-by-step sample problems that the student can consult later.
• Practice problems randomly generated until student shows mastery.
• All solutions are entered step-by-step.
• All legitimate solution methods supported.
• Any incorrect step is flagged as soon as it is typed.
• A hint or suggested next step can always be requested.
• Intelligent help at every step, including instant prerequisite review.
• Solution strategy changes intelligently in response to the student's steps.
• 700 practice problem forms generating 100,000+ distinct problems.

See also:

• List of topics covered in each student program.