Expression 6: 0 less than or equal to "y" less than or equal to "f" left parenthesis, ceil left parenthesis, StartFraction, "n" left parenthesis, "x" minus "a" , right parenthesis Over "b" minus "a" , EndFraction , right parenthesis StartFraction, "b" minus "a" Over "n" , EndFraction plus "a" , right parenthesis left brace, "a" less than or equal to "x" less than or equal to "b" , right brace Has graph. To audio trace, press ALT+T.0≤y≤fceilnx−ab−ab−an+aa≤x≤b
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Expression 7: 0 greater than or equal to "y" greater than or equal to "f" left parenthesis, ceil left parenthesis, StartFraction, "n" left parenthesis, "x" minus "a" , right parenthesis Over "b" minus "a" , EndFraction , right parenthesis StartFraction, "b" minus "a" Over "n" , EndFraction plus "a" , right parenthesis left brace, "a" less than or equal to "x" less than or equal to "b" , right brace Has graph.0≥y≥fceilnx−ab−ab−an+aa≤x≤b