The Centroid of the triangle formed by the lines $6 x^2+x y-y^2=0$ and $x+3 y-10=0$ is

The Centroid of the triangle formed by the lines $6 x^2+x y-y^2=0$ and $x+3 y-10=0$ is
  1. $\left(\frac{1}{3}, \frac{7}{3}\right)$
  2. $\left(-\frac{1}{3}, \frac{-7}{3}\right)$
  3. $\left(-\frac{1}{3}, \frac{7}{3}\right)$
  4. $\left(\frac{1}{3}, \frac{-7}{3}\right)$

Solution

$\begin{aligned} & 6 x^2+x y-y^2=0 \\ & \Rightarrow(3 x-y)(2 x+y)=0 \\ & \Rightarrow 3 x-y=0,2 x+y=0 \\ & \Rightarrow L_1 \equiv 3 x-y=0, L_2 \equiv 2 x+y=0 \text { and } L_3 \equiv x+3 y=10 \\ & \text { point of intersection of } \\ & L_1 \text { and } L_2 \text { is }(0,0), L_2 \text { and } L_3 \text { is }(-2,4), L_3 \text { and } L_1 \text { is }(1,3) \\ & \Rightarrow \text { centroid of triangle } \equiv\left(\frac{0-2+1}{3}, \frac{0+4+3}{3}\right) \equiv\left(\frac{-1}{3}, \frac{7}{3}\right)\end{aligned}$

Asked in: MHT CET 2022 (08 Aug Shift 2)

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