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Question
Find the angle between the lines x = a and by + c = 0..
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Solution
The given lines can be written as
x = a ... (1)
\[y = - \frac{c}{b}\] ... (2)
Lines (1) and (2) are parallel to the y-axis and x-axis, respectively. Thus, they intersect at right angle, i.e. at 90°.
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