Q.

The differential equation of all straight lines passing through the origin is:

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a

y=xdydx

b

dydx=y+x

c

dydx=yx

d

None of these

answer is C.

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Detailed Solution

The equation of all straight lines passing through the origin is

 y = mx ... (i) 

where m is arbitrary constant Differentiate (i) w.r.t. x, we get

dydx=mdydx=yx          By(i)

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