It is known that y is the inverse proportional function of X, and when x = - 2, y = - 5, the expression of this function and the value range of the independent variable X are obtained
Let the function be a (1 / x) = y
When x = - 2, y = - 5; a = 10; so: y = 10 / x, x value range: X is not equal to 0;
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