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Find the angles between each of the foll...

Find the angles between each of the following pairs of straight line: `\ 3x+4y-7=0\ a n d\ 4x-3y+5=0`

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Let m_1 and m_2 be the slopes of these lines. `m_1 = −3/4 ,m_2 = 4/3 ,m_1.m_2 = −3/4×4/3=−1 `
Hence, the given lines are perpendicular. Therefore, the angle between them is` 90^@.`
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