Expression 5: "S" left parenthesis, "L" , "R" , right parenthesis equals negative StartFraction, StartNestedFraction, "d" NestedOver "d" "x" , EndNestedFraction left parenthesis, "L" minus "R" , right parenthesis Over StartNestedFraction, "d" NestedOver "d" "y" , EndNestedFraction left parenthesis, "L" minus "R" , right parenthesis , EndFractionSL,R=−ddxL−RddyL−R
5
Now, we can create a regression statement that sets the slopes of the two equations equal and thus solves for t (drag the vertical divider on the right edge of this pane to make it wider so you can easily see the whole entry below):
6
Expression 7: "S" left parenthesis, 4 "x" minus 3 "y" plus 10 , negative 8 "x" minus 7 "y" minus 2 , right parenthesis tilde "S" left parenthesis, negative 3 "x" plus "t" "y" , 5 "y" minus 9 , right parenthesisS4x−3y+10,−8x−7y−2~S−3x+ty,5y−9