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KCET · Maths · Straight Lines

A line cuts off equal intercepts on the co-ordinate axes. The angle made by this line with the
positive direction of \( X \)-axis is

  1. A \( 90^{\circ} \)
  2. B \( 135^{\circ} \)
  3. C \( 45^{\circ} \)
  4. D \( 120^{\circ} \)
Verified Solution

Answer & Solution

Correct Answer

(B) \( 135^{\circ} \)

Step-by-step Solution

Detailed explanation

(B)

\[
\begin{array}{l}
x+y=a \\
\frac{d y}{d x}=-1 \\
\tan \theta=-1 \\
\theta=\pi-\frac{\pi}{4}=\frac{3 \pi}{4} \Rightarrow \theta=135^{\circ}
\end{array}
\]