⁦Continuity and rate of change⁩

⁦See when a graph can be drawn without lifting the pen, find the k that makes a function continuous, and squeeze an average rate of change down to an instantaneous one⁩.

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الدليل

⁦A function f is continuous at a if three things hold⁩: ⁦f(a) exists, the limit of f as x → a exists, and the two are equal⁩. ⁦That means the graph has no hole and no jump there⁩.

⁦The average rate of change over an interval is the gradient of the line joining two points of the graph⁩: ⁦change in y divided by change in x⁩. ⁦Shrinking the interval gives the rate of change at one instant⁩.