007A Sample Midterm 2, Problem 2

Use the definition of the derivative to find Failed to parse (MathML with SVG or PNG fallback (recommended for modern browsers and accessibility tools): Invalid response ("Math extension cannot connect to Restbase.") from server "https://wikimedia.org/api/rest_v1/":): {\displaystyle \frac{dy}{dx}} for the function $y={\frac {1+x}{3x}}.$