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Answer:
- C = (5/9)(F -32)
 - 50°F ⇒ 10°C
 
Explanation:
Starting with the formula for degrees Fahrenheit, we can solve for degrees Celsius.
 F = 32 +9/5C
 F -32 = (9/5)C . . . . . subtract 32
 (5/9)(F -32) = C . . . . multiply by the inverse of the coefficient of C
The formula for Celsius temperature from Fahrenheit temperature is ...
 C = (5/9)(F -32)
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For F = 50, the corresponding Celsius temperature is ...
 C = (5/9)(50 -32) = (5/9)(18) = 10 . . . degrees Celsius