This explores the concepts and skills of Simultaneous equations using practical scenarios such as ages of 2 children, prices of apples and bananas, etc. The methods of Substitution, Elimination and Graphs are exemplified.
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Good idea that is why I gave it OK, however, there is a mistake already from the beginning ( Jack's step must be given by S=6-t for the table and result to be correct. if you leave the numbers how you put them then the the time 2.5 and the step will be 4.5
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