The slopes of the lines, making angle of measures $45^{\circ}$ with the line $2 x-3 y=5$ are

The slopes of the lines, making angle of measures $45^{\circ}$ with the line $2 x-3 y=5$ are
  1. $5, \frac{-1}{5}$
  2. $\frac{-1}{5},-5$
  3. $\frac{1}{5},-5$
  4. $5, \frac{1}{5}$

Solution

Let the required slope of the line be $m$ $\begin{aligned} & \Rightarrow \tan 45^{\circ}=\left|\frac{m-\frac{2}{3}}{1+m \times \frac{2}{3}}\right| \\ & \Rightarrow \frac{3 m-2}{3+2 m}= \pm 1 \\ & \Rightarrow m=5 \text { or } m=\frac{-1}{5}\end{aligned}$

Asked in: MHT CET 2022 (10 Aug Shift 2)

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