Learn about and revise how to create and solve simultaneous equations, including the use of graphs to produce solutions with Bitesize GCSE Maths Edexcel .

Learn and revise how to plot coordinates and create straight line graphs to show the relationship between two variables with GCSE Bitesize Edexcel Maths.

Logarithmic convexity type continuous dependence results for discrete harmonic functions defined as solutions of the standard $C^0$ piecewise-linear approximation to Laplace's equation are proved.