If y = 3x to the - 2 power, is this a positive proportional function?

If y = 3x to the - 2 power, is this a positive proportional function?

Generally, the relation between two variables X and y can be expressed as a function of y = KX (k is a constant and K ≠ 0), then y is called the positive proportional function of X
The degree of X is 1, not - 2
So it's not a positive scale function
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If the function y = (b-3x + B's square-9 is a positive proportional function, then B = what

Let y = b-3x + B & # 178; - 9 be a positive proportional function,
∴b+b²-9=0
b=（-1±√（1+9×4）/2
=（-1±√37）/2.

What is the analytic expression of the positive proportional function passing through point (2,4)?

y=2x