If the function y = (m-2) x + 5-m is a positive proportional function, then the value of M is (), and the analytic expression of this function is ()

If the function y = (m-2) x + 5-m is a positive proportional function, then the value of M is (), and the analytic expression of this function is ()

If the function y = (m-2) x + 5-m is a positive proportional function, then the value of M is (5), and the analytic expression of this function is (y = 3x)