Expression 6: "y" equals left parenthesis, 0.2 8 2 , right parenthesis "x" left parenthesis, 29.7 minus 2 "x" , right parenthesis left parenthesis, 21 minus 2 "x" , right parenthesisy=0.282x29.7−2x21−2x
6
Expression 7: "y" equals left parenthesis, 0.3 1 2 , right parenthesis "x" left parenthesis, 29.7 minus 2 "x" , right parenthesis left parenthesis, 21 minus 2 "x" , right parenthesisy=0.312x29.7−2x21−2x