15. Obtain the differential equation of the family of straight lines through the point (5, 2). (y-5)dx+(x-2)dy=0 b. (y+2)dx-(x+5)dy=0 d. (y-2)dx-(x-5)dy = 0 a. c. (y-2)dx+(x−5)dy=0

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A:

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A: 22)

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Q: need to know how many antique coins he found?

A: From the above solution ,  Total coins = 180  Newer coins  = 135