If y = (m-2) x + (M2-4) is a positive proportional function, then the value of M is () A. 2B. - 2C. ± 2D. Any real number

If y = (m-2) x + (M2-4) is a positive proportional function, then the value of M is () A. 2B. - 2C. ± 2D. Any real number

According to the meaning of the question: M2 − 4 = 0m − 2 ≠ 0; m = - 2