Given that y=ln(7x)y = \ln(7x)y=ln(7x), find dydx\frac{dy}{dx}dxdy. Select the correct option:
A: dydx=1x\frac{dy}{dx} = \frac{1}{x}dxdy=x1
B: dydx=7x\frac{dy}{dx} = \frac{7}{x}dxdy=x7
C: dydx=17x\frac{dy}{dx} = \frac{1}{7x}dxdy=7x1
D: dydx=ln(7)\frac{dy}{dx} = \ln(7)dxdy=ln(7)
375 exam-style questions on AQA A Level Maths 1.10 G: Differentiation, covering 1.10.1 The derivative and second derivative, 1.10.2 Differentiating standard functions, 1.10.3 Applications of differentiation, 1.10.4 Product, quotient and chain rules (A-level only), 1.10.5 Implicit and parametric differentiation (A-level only), and 1.10.6 Constructing differential equations (A-level only). Each one has a worked solution and a mark scheme showing where the marks go.