Expression 4: "g" left parenthesis, "x" , right parenthesis equals StartFraction, "P" . "y" minus "W" . "y" Over "P" . "x" minus "W" . "x" , EndFraction left parenthesis, "x" minus "P" . "x" , right parenthesis plus "P" . "y"gx=P.y−W.yP.x−W.xx−P.x+P.y
4
Q=(-1,-12) "Q" equals left parenthesis, negative 1 , "g" left parenthesis, negative 1 , right parenthesis , right parenthesisQ=−1,g−1
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equals=
left parenthesis, negative 1 , negative 12 , right parenthesis−1,−12