In the following functions, X is an independent variable and Y is a dependent variable. Which are primary functions and which are positive proportional functions? (1) Y = 5 of X (2) y = 5 of X (3) y = - 3x + 1 (4) y = x & sup2; - 1 (5) - 2 of X + 1 Give reasons

In the following functions, X is an independent variable and Y is a dependent variable. Which are primary functions and which are positive proportional functions? (1) Y = 5 of X (2) y = 5 of X (3) y = - 3x + 1 (4) y = x & sup2; - 1 (5) - 2 of X + 1 Give reasons

The first is that the positive scaling function can be reduced to 1 / 5x
The second is neither a positive proportional function nor a linear function
The third is that a function of degree is not a positive proportional function
The fourth is that quadratic function is not a positive proportion function
The fifth is not in the form of a function
PS: the form of positive scale function is y = KX
The form of linear function is y = KX + B
The form of quadratic function is ax ^ 2 + BX + C