Expression 8: "y" equals "a" left brace, left bracket, "Q" Subscript, 0 , Baseline , "Q" Subscript, 3 , Baseline , right bracket less than or equal to "x" less than or equal to left bracket, "Q" Subscript, 1 , Baseline , "Q" Subscript, 4 , Baseline , right bracket , right brace Has graph. To audio trace, press ALT+T.y=aQ0,Q3≤x≤Q1,Q4
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Expression 9: "x" equals left bracket, "Q" Subscript, 1 , Baseline , "Q" Subscript, 2 , Baseline , "Q" Subscript, 3 , Baseline , right bracket left brace, "a" minus "b" less than or equal to "y" less than or equal to "a" plus "b" , right brace Has graph. To audio trace, press ALT+T.x=Q1,Q2,Q3a−b≤y≤a+b
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Expression 10: "y" equals left bracket, "a" plus "b" , "a" minus "b" , right bracket left brace, "Q" Subscript, 1 , Baseline less than or equal to "x" less than or equal to "Q" Subscript, 3 , Baseline , right brace Has graph. To audio trace, press ALT+T.y=a+b,a−bQ1≤x≤Q3