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यदि परिमेय संख्याओं का समुच्चय Q तथा फलन `f:Q rarr Q` सम्बन्ध `f(x)=5x-4,x in Q` से परिभाषित है, तो सिद्ध कीजिए कि f एकैकी और आच्छादक फलन है । `f^(-1)

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यदि परिमेय संख्याओं का समुच्चय Q तथा फलन `f:Q rarr Q` सम्बन्ध `f(x)=5x-4,x in Q` से परिभाषित है, तो सिद्ध कीजिए कि f एकैकी और आच्छादक फलन है । `f^(-1)` को भी परिभाषित कीजिए ।
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`f^(-1):Q rarr Q, f^(-1)(y)=(y+4)/(5)`
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