Simultaneous Equations Lesson

Lesson on simultaneous equations (in which equations are to be taken away only - ie, all positives used). Differentiated learning outcomes; bronze: solve simultaneous equations where neither equation has to be changed, silver: solve where one equations has to be changed, gold: solve where both equations have to be changed. Included: lesson plan, powerpoint with outcomes / plenary questions, 'pit&' activity, and differentiated worksheet.