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The following expression is used for changing a temperature of -35 Celsius degrees to Fahrenheit.

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4 Answers

To go from Celsius to Fahrenheit add 40, multiply by 9/5, subtract 40.
-35+40=5; 5×9/5=9; 9-40=-31
To go from Fahrenheit to Celsius add 40, multiply by 5/9, subtract 40.
-31+40=9; 9×5/9=5; 5-40=-35
  °C   °F
100 212 Boiling point of water
    0  32 Freezing point of water
 
(C-0)/(F-32) = (100-0)/(212-32) = 100/180 = 5/9
 
C = 5/9 (F-32)
 
9/5 C = F - 32
 
F = 9/5 C + 32
 
F = 9/5 (-35°C) + 32 = 9(-7) + 32 = -63 + 32 = -31°F
Your conversion formula is correct.  For a  given temperature Tc in degrees Celsius (°C), the equivalent temperature in degrees Fahrenheit (°F), Tf, is:
 
Tf = (9/5)(Tc)+(32)
 
For Tc = -35°C
 
Tf = (9/5)(-35)+32 = -31°F