November 13th, 2016, 10:56 PM  #1 
Newbie Joined: Nov 2016 From: South Africa Posts: 6 Thanks: 0  Diagram of rhombus
Rhombus diagram, Q(8;6), R, S and T(3:9). The equation of QS is x+3y=10. Show that the equation of RT = 3xy=0 
November 13th, 2016, 11:18 PM  #2 
Newbie Joined: Nov 2016 From: South Africa Posts: 6 Thanks: 0  http://www.edwardsmaths.com/wpconte...PaperEng.pdf question 4 is the same diagram 
November 14th, 2016, 12:52 AM  #3 
Global Moderator Joined: Dec 2006 Posts: 16,944 Thanks: 1255 
The diagonals of a rhombus are perpendicular, so the product of their gradients is 1. The gradient of QS is 1/3 so the gradient of RT is 3. As RT contains the point (3, 9), RT has equation y = 3x (where x ∈ [1, 3]). 

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