Most countries in the world use the temperature of Celsius (℃), but the weather forecast of the United States, Britain and other countries still uses the temperature of Fahrenheit (), and there are so

Most countries in the world use the temperature of Celsius (℃), but the weather forecast of the United States, Britain and other countries still uses the temperature of Fahrenheit (), and there are some differences between the two measured values. (1) Let the functional relationship between the temperature of Celsius x(℃) and the temperature of Fahrenheit y(℉) be y = kx+b.

32=b50= 10k+b，

Solution: k = 1.8b = 32.

That is y = 1.8x+32.

The functional relationship between the centigrade temperature x(℃) and the Fahrenheit temperature y(℉) is as follows:

y = 1.8x+32；

(2) When y=0, 0= 1.8x+32.

Solution: x =? 1609;

(3) yes;

When y=x, x= 1.8x+32,

Solution: x =-40.

So when it's MINUS 40 degrees Fahrenheit, it's MINUS 40 degrees Celsius.