Straight-line Graphs

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This video resource from Teachers TV is presented by Fran and Dave, who demonstrate practical applications of mathematics as they investigate how straight line graphs can be used to compare the price difference of two mobile phone deals.

Formulae are developed and graphs drawn to show how the cost of 'pay as you go' and 'monthly contract' tariffs compare. Students are then challenged to determine how many days a month someone using pay as you go can access the internet without exceeding the annual cost of a monthly contract.

Calculations are performed in stages throughout the video, offering a pause point for teachers to hold a freeze frame on screen while students discuss the problem and perform the calculations themselves.

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