Question

If in a parallelogram $ABDC$, the coordinates of $A, B$ and $C$ are respectively $(1, 2), (3, 4)$ and $(2, 5),$ then the equation of the diagonal $AD$ is :

• A. 5x + 3y - 11 = 0
• B. 3x - 5y + 7 = 0
• C. 3x + 5y - 13 = 0
• D. 5x - 3y + 1 = 0

Answer 1

Answer: (D)

5x - 3y + 1 = 0

Answer 2

co-ordinates of point $D$ are $(4,7)$
$\Rightarrow$ line $AD$ is $5x - 3y + 1 = 0$