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-- The celsius number and the Fahrenheit number are both functions of the temperature of the sample.

-- The celsius degree is larger than the Fahrenheit degree, i.e. it represents a larger change in temperature.

-- Therefore the celsius scale and the Fahrenheit scale can be represented as straight-line graphs with different slopes.

-- Since they have different slopes, they are not parallel.

-- Since they are not parallel, they must intersect somewhere.

-- The celsius scale is defined as: The freezing point of water is 'zero', and the boiling point of water is 100 degrees higher.

-- The Fahrenheit scale is defined as: The freezing point of water is +32, and the boiling point of water is 180 degrees higher.

-- Taking these two definitions, and using algebra to find the point where the two scales intersect, it is found to be at -40 degrees.

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Q: Why -40 degrees Fahrenheit equals -40 celsius?
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