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Remember that the equation of a straight line (when given two points OR a point and a gradient) is y-y_1 = m(x-x_1) where m is the gradient and (x_1,y_1) is a point on the line.

Since we have two p...

Rates and differential equations is a topic many students find difficult, especially when solving the differential equation is combined with techniques from other topics on the C4 syllabus. I hope my walk...

Firstly we must notice that we can differentiate each term separately.

Starting with the 2xy term, we must use the product rule as x and y are two variable that will differentiate. Setting u=2x and...

This simply means, 'the next best alternative foregone'. We can explain this by saying if I only had £5 to buy lunch, I could either buy a sandwich or half a pizza. The opportunity cost of me buying a san...

The difference between a codified and uncodified constitution is quite simple. Codified means the constitution is written down in a single document. The US constitution is codified. An uncodified constitu...