Tangent Line Approximation

Let $$y = f(x)$$ be a differentiable function such that $$\displaystyle\frac{dy}{dx} = \frac{2x+1}{y}$$ and $$f(1) = 3$$. What is the approximation for $$f(0.9)$$ found by using the tangent line to the graph of $$f$$ at $$x=1$$?