Given that y = (M + 3) XM2 − 8 is a positive proportional function, then M=______ .

Given that y = (M + 3) XM2 − 8 is a positive proportional function, then M=______ .

According to the definition of positive proportion function, M + 3 ≠ 0, m2-8 = 1, then M = 3