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http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Mathematics (9709)/9709_w11_qp_12.pdf
q9 (i), how do i calculate co ordiates of D :/
Since you're only asking about D, I'm going to guess you found M... which is (5,2)
M is the midpoint between B and D
The formula for midpoint would be..
(x2-x1)/2 , (y2-y1)/2
So (x2-x1)/2, where x2 is the x value of D, and x1 is the x value of B are equal to 5, the x value of M the midpt. Solve.
So (y2-y1)/2, where y2 is the y value of D, and y1 is the y value of B are equal to 2, the y value of M the midpt. Solve.
You'll get
x2= 7
y2= -2