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The length L (in centimetre) of a copper...

The length L (in centimetre) of a copper rod is a linear function of its Celsius temperature C. In an experiment, if `L = 124. 942` when `C = 20` and `L= 125. 134`when `C = 110`, express L in terms of C.

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In the form `(C,L)`, two points lying on the line are `(20,124.942)` and `(110,125.134)`.
`:.` Equation of required line is,
`L-124.942=(125.134-124.942)/(110-20)(C-20)`
`L=(0.192)/(90)(C-20)+124.942`
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