Expression 9: "y" equals 16 minus StartFraction, 6 Over 1 plus "e" Superscript, negative "x" , Baseline , EndFraction plus StartFraction, 2 Over 1 plus "e" Superscript, 17 minus "x" , Baseline , EndFraction plus StartFraction, 6 Over 1 plus "e" Superscript, negative "x" plus 27 , Baseline , EndFraction minus StartFraction, 5 Over 1 plus "e" Superscript, 37 minus "x" , Baseline , EndFraction minus StartFraction, 12 Over 1 plus "e" Superscript, 47 minus "x" , Baseline , EndFractiony=16−61+e−x+21+e17−x+61+e−x+27−51+e37−x−121+e47−x