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## Homework Statement

[itex]yy' + x = \sqrt{x^2 + y^2}[/itex]

## Homework Equations

y = vx

y' = v'x + v

## The Attempt at a Solution

[itex]y' + \frac{x}{y} = \frac{\sqrt{x^2 + y^2}}{y}[/itex]

[itex](v'x+v) + v =\frac{ \sqrt{x^2 + (vx)^2}}{vx}[/itex]

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