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Question

Write the distance between the lines 4x + 3y − 11 = 0 and 8x + 6y − 15 = 0.

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Solution

The distance between the two parallel lines ax+by+c1=0 and ax+by+c2=0 is c1-c2a2+b2.
The given lines can be written as

4x + 3y − 11 = 0 ... (1)

8x+6y-15=0 4x+3y-152=0 ... (2)

Let d be the distance between the lines (1) and (2).

d=-11--15242+32=710 units

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