P+Q: left parenthesis, "x" Subscript, 4 , Baseline , "y" Subscript, 4 , Baseline , right parenthesisx4,y4
Label:
25
Expression 26: "m" Subscript, 5 , Baseline equals StartFraction, left parenthesis, "y" Subscript, 3 , Baseline minus "y" Subscript, 2 , Baseline , right parenthesis Over left parenthesis, "x" Subscript, 3 , Baseline minus "x" Subscript, 2 , Baseline , right parenthesis , EndFractionm5=y3−y2x3−x2
Q+R: left parenthesis, "x" Subscript, 5 , Baseline , "y" Subscript, 5 , Baseline , right parenthesisx5,y5
Label:
30
Expression 31: "m" Subscript, 6 , Baseline equals StartFraction, left parenthesis, "y" Subscript, 4 , Baseline minus "y" Subscript, 3 , Baseline , right parenthesis Over left parenthesis, "x" Subscript, 4 , Baseline minus "x" Subscript, 3 , Baseline , right parenthesis , EndFractionm6=y4−y3x4−x3
(P+Q)+R: left parenthesis, "x" Subscript, 6 , Baseline , "y" Subscript, 6 , Baseline , right parenthesisx6,y6
Label:
35
Expression 36: "m" Subscript, 7 , Baseline equals StartFraction, left parenthesis, "y" Subscript, 1 , Baseline minus "y" Subscript, 5 , Baseline , right parenthesis Over left parenthesis, "x" Subscript, 1 , Baseline minus "x" Subscript, 5 , Baseline , right parenthesis , EndFractionm7=y1−y5x1−x5