Question

if A (6,3) , B (3,5) , C(4,-2),D(x,3x) are four points and the magnitude of the area of triangle ABC IS TWICE THE AREA OF TRIANGLE DBC then x =

Answer 1

Area of the ∆ABC=2(Area of the ∆DBC).
1/2|6(4+2)+3(-2-3)+4(3-5)|=2(1/2)|x(5+2)+3(-2-3x)+4(5-3x)|.
continue.
you will get your answer..