At the start of the lesson students review deriving and solving a simple equation from a geometrical puzzle.  The development phase goes on to solving two equations with as many unknowns using the method of elimination.In this lesson the coefficients of the unknowns are either equal to each other or one is a factor of the other.

Differentiated Learning Objectives

• All students should be able to solve a pair of equations simultaneously using the method of elimination given equal coefficients of one unknown.
• Most students should be able to solve a pair of equations simultaneously using the method of elimination where one coefficient is a factor of the other.
• Some students should be able to derive and solve a pair of equations simultaneously using the method of elimination where one coefficient is a factor of the other.

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