Question 201410
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Use the two-point form of the equation of a line:


*[tex \LARGE \ \ \ \ \ \ \ \ \ \ y - y_1 = \left(\frac{y_1 - y_2}{x_1 - x_2}\right)(x - x_1) ]


Where *[tex \Large \left(x_1,y_1\right)] and *[tex \Large \left(x_2,y_2\right)] are the coordinates of your two selected points.  Choose one of the variables in the above to represent Fahrenheit and let the other represent Celsius.  Alternatively, you could change all of the *[tex \Large y]s to *[tex \Large F]s, and the *[tex \Large x]s to *[tex \Large C]s.


Either way, once you have derived your equation, substitute 70 for the variable you have chosen to represent Celsius and then solve for the other variable.


John
*[tex \LARGE e^{i\pi} + 1 = 0]
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