The Nuffield Foundation provide this resource which can be used to introduce the shape and main features of proportional, linear, inverse proportional, and quadratic graphs. Different versions of Excel spreadsheets allow students to explore how the shape and the position of a graph changes when the constants in its equation are altered. Students will look for connections between the numbers in equations like y = 2x + 3, y = 20/ x , y = x2 + 5x – 3 and the graphs that represent them.
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