We know the function y = (2-m) x + 2m-3. When m is the value of (1) this function is a linear function? (2) Is this function a positive scale function?

(1) When 2-m ≠ 0, that is, m ≠ 2, y = (2-m) x + 2m-3 is a linear function; (2) 2m-3 = 0, and 2-m ≠ 0, that is, M = 32, y = (2-m) x + 2m-3 is a positive proportional function

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