# Exam-Style Question on Graphs

## A mathematics exam-style question with a worked solution that can be revealed gradually

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Question id: 367. This question is similar to one that appeared on a GCSE Higher paper in 2017. The use of a calculator is allowed.

The graph shows the temperature ($$T$$) of an unidentified flying object over a period of 10 seconds ($$t$$).

Use the graph to work out an estimate of the rate of decrease of temperature at 7 seconds. You must show your working.

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If you need more practice try the self-checking interactive exercises called Gradient of a Line.

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