1.

The differential equation of all non-vertical lines in a plane, isA. `(d^(2)y)/(dx^(2))=0`B. `(d^(2)x)/(dy^(2))=0`C. `(dy)/(dx)=0`D. `(dx)/(dy)=0`

Answer» Correct Answer - A
The general equation all non-vertical lines in a plane is `ax+by=1`, where `b ne 0`.
Now,
`ax+by=1`
`rArr" "a+b(dy)/(dx)=0" [Differentiating w.r. to x]"`
`rArr" "b(d^(2)y)/(dx)=0" [Differentiating w.r. to x]"`
`rArr" "(d^(2)y)/(dx^(2))=0" "[because b ne 0]`
Hence, the differential equation is `(d^(2)y)/(dx^(2))=0`


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