Death, psychosis, apocalypse — it’s a strong mixture for a novel. In the hands of a writer less capable than Edward St Aubyn, it would probably add up to a fatal dose for a book that you were actually ...

Higher - The gradients of two perpendicular lines will always multiply to make –1. Make sure you are familiar with finding the equation of a line and calculating gradient to understand equations of ...

Roula Khalaf, Editor of the FT, selects her favourite stories in this weekly newsletter. Therapist Martin Carr is in a quandary. He has learnt that a new patient, Carmen, is already known to his ...

Horizontal lines run left to right, parallel to the horizon, with slope 0 and equation y = k. Vertical lines run top to bottom, perpendicular to the horizon, with undefined slope and equation x = k.