Derivatives: definitions, notation, and rules. A derivative is a function which measures the slope. It depends upon x in some way, and is found by differentiating a function of the form y = f (x).

The composite function chain rule notation can also be adjusted for the multivariate case: Then the partial derivatives of z with respect to its two independent variables are defined as: Let's do the ...

Revise how to work out the equation of a straight line using coordinates and the gradient, and vice versa. BBC Bitesize Scotland SQA National 5 Maths.