The linear function of (1) is y=x+b, and the inverse proportional function is y= 1/x, so the simultaneous formula shows that the intersection point is A(-b+√b? +4/2, 1/-b+√b? +4/2),B(-b-√b? +4/2, 1/-b-√b? +4/2)。
(2) The value of the original function is smaller than that of the inverse proportional function, and the range is between AB points, so it is (-b-√b? +4/2,-b+√b? +4/2)。
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