Expression 1: "y" equals left parenthesis, negative StartFraction, 1 Over left parenthesis, "x" minus 4 , right parenthesis squared , EndFraction minus StartFraction, 1 Over left parenthesis, "x" plus 4 , right parenthesis squared , EndFraction , right parenthesis plus 4 left brace, 0 less than or equal to "y" , right brace left brace, negative 12 less than or equal to "x" less than or equal to 12 , right bracey=−1x−42−1x+42+40≤y−12≤x≤12