(20 13? Yulin) Craftsmen make a metal tool by calcination and forging, that is, they need to burn the material to 800℃ and then stop calcination and forging. After 8min, the material temperature dropped to 600℃. The temperature y(℃) and time x (minutes) in the calcination process are linear functions. When forging, the temperature y(℃) is inversely proportional to the time x(min) (as shown in the figure). It is known that the starting temperature of this substance is 32℃.

(1) The functional relationship between Y and X during calcination and forging of materials was obtained respectively, and the range of independent variable X was written.