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METEOROLOGIST JEFF HABY. F = 9/5*C + 32. To find the temperature both scales are equal we can use another equation and combine it with this previous equation. The equation is simply F = C. Plug in for F or C and solve. C = 9/5*C + 32. -4/5*C = 32. F = 9/5*F + 32. -4/5*F = 32. Thus, at the cold temperature of negative 40, this temperature is the same on both the Fahrenheit and Celsius temperature scales.
A temperature interval of one degree Fahrenheit is an interval of $\frac{5}{9}$ of a degree Celsius. Both the scales (Fahrenheit and Celsius) coincide at â40 degrees (i.e. â40 Â°F = â40 Â°C). Absolute zero in Fahrenheit is â459.67 Â°F.