Expressão 4: left parenthesis, "y" minus "a" . "y" , right parenthesis equals StartFraction, "b" . "y" minus "a" . "y" Over "b" . "x" minus "a" . "x" , EndFraction left parenthesis, "x" minus "a" . "x" , right parenthesisy−a.y=b.y−a.yb.x−a.xx−a.x
4
Expressão 5: left parenthesis, "y" minus "a" . "y" , right parenthesis minus StartFraction, "b" . "y" minus "a" . "y" Over "b" . "x" minus "a" . "x" , EndFraction left parenthesis, "x" minus "a" . "x" , right parenthesis equals 0y−a.y−b.y−a.yb.x−a.xx−a.x=0
5
Expressão 6: "y" minus StartFraction, "b" . "y" minus "a" . "y" Over "b" . "x" minus "a" . "x" , EndFraction "x" equals "a" . "y" minus "a" . "x" StartFraction, "b" . "y" minus "a" . "y" Over "b" . "x" minus "a" . "x" , EndFractiony−b.y−a.yb.x−a.xx=a.y−a.xb.y−a.yb.x−a.x
6
Expressão 7: left parenthesis, "b" . "x" minus "a" . "x" , right parenthesis "y" minus left parenthesis, "b" . "y" minus "a" . "y" , right parenthesis "x" greater than left parenthesis, "b" . "x" minus "a" . "x" , right parenthesis "a" . "y" minus left parenthesis, "b" . "y" minus "a" . "y" , right parenthesis "a" . "x"b.x−a.xy−b.y−a.yx>b.x−a.xa.y−b.y−a.ya.x
