表达式62: "y" equals "m" Subscript, 5 , Baseline left parenthesis, "x" minus "E" Subscript, 1 , Baseline , right parenthesisy=m5x−E1
62
表达式63: "y" equals negative "m" Subscript, 6 , Baseline left parenthesis, "x" minus "G" Subscript, 1 , Baseline , right parenthesisy=−m6x−G1
63
表达式64: "m" Subscript, 5 , Baseline left parenthesis, "x" minus "E" Subscript, 1 , Baseline , right parenthesis equals negative "m" Subscript, 6 , Baseline left parenthesis, "x" minus "G" Subscript, 1 , Baseline , right parenthesism5x−E1=−m6x−G1