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STD 11 - 9. straight line — JEE STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceJEESTD 11 - 9. straight line4 Marks
Question
The obtuse angle between the lines $y = - \;2$ and $y = x + 2$ is ....$^o$
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Answer

b
(b) The gradient of the line $y = x + 2$ is $1$. Therefore, it makes an angle of ${45^o}$ with $x$-axis. The second line is parallel to $x$-axis. Hence the obtuse angle between the lines is ${135^o}$.

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