Expression 29: "m" Subscript, 1 , Baseline equals StartFraction, "D" Subscript, 2 , Baseline minus "A" Subscript, 2 , Baseline Over "D" Subscript, 1 , Baseline minus "A" Subscript, 1 , Baseline , EndFractionm1=D2−A2D1−A1
equals=
22
29
Expression 30: "y" equals "m" Subscript, 1 , Baseline left parenthesis, "x" minus "A" Subscript, 1 , Baseline , right parenthesis plus "A" Subscript, 2 , Baseliney=m1x−A1+A2