Fahrenheit and Celsius have -40 degrees in common

[hurlgyrl]

I know the formula on how to get -40 degrees in Celsius, but what is the formula to get -40 degrees in Fahrenheit? How do I show that -40 degrees is the only temperature Fahrenheit and Celsius have in common?

 

[Denis]

Not sure what you're asking...anyway:

C = 5(F - 32) / 9 : that converts Fahrenheit to Celsius

Now get above equation in terms of F

 

[Deleted member 4993]

Let the common temperature = T

So (according to the formula supplied by Denis)

T = (T-32) * 9/5

Solve for 'T'.

 

[skeeter]

I know the formula on how to get -40 degrees in Celsius, but what is the formula to get -40 degrees in Fahrenheit? How do I show that -40 degrees is the only temperature Fahrenheit and Celsius have in common?

the linear scales cross at -40 degrees.

C = (9/5)F + 32
substitute (-40) for F, calculate C.

F = (5/9)(C - 32)
substitute (-40) for C, calculate F.