In what ratio does y-axis divide the line segment joining the points

Question:

In what ratio does y-axis divide the line segment joining the points (−4, 7) and (3, −7)?  

Solution:

Let y-axis divides the line segment joining the points (−4, 7) and (3, −7) in the ratio : 1. Then

$0=\frac{3 k-4}{k+1}$

$\Rightarrow 3 k=4$

$\Rightarrow k=\frac{4}{3}$

Hence, the required ratio is 4 : 3.

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