1. http://ie.ixl.com/math/year-5
2. http://ie.ixl.com/math/year-3/solve-simultaneous-equations-using-elimination-word-problems
3. http://ie.ixl.com/math/year-5/solve-logarithmic-equations-ii
4. http://ie.ixl.com/math/year-5/simplify-radical-expressions-using-conjugates
5. http://ie.ixl.com/math/year-5/solve-non-linear-simultaneous-equations
6. http://ie.ixl.com/math/year-5/solve-a-quadratic-equation-using-the-quadratic-formula
7. Don't forget these!
Systems of three variables: Systems of Three Variables
Mr.Sweeney.
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