It is known that the image of positive scale function y = (K + 2) x has two points a (X &;, Y &;) B (X &;, Y &;) When X &; < x &;, Y &; > y &;, then the value range of K is______ .

It is known that the image of positive scale function y = (K + 2) x has two points a (X &;, Y &;) B (X &;, Y &;) When X &; < x &;, Y &; > y &;, then the value range of K is______ .

Because X &; < x &;, Y &; > y &;, K + 2 < 0, K < - 2