When m, y = (M-4) x to the power of 2m + 1 + 4x-5 is a linear function

When m, y = (M-4) x to the power of 2m + 1 + 4x-5 is a linear function

If y is a function of degree, then x is of degree 1
There's 4x in the back
So (2m + 1) is once or zero
So 2m + 1 = 1 or 2m + 1 = 0
m=0,m=-1/2