Expression 1: "y" equals StartFraction, left parenthesis, 2 left parenthesis, "x" plus 4 , right parenthesis left parenthesis, 5 "x" minus 1 , right parenthesis , right parenthesis Over left parenthesis, 8 minus "x" , right parenthesis left parenthesis, 7 "x" plus 2 , right parenthesis , EndFractiony=2x+45x−18−x7x+2