Data from an experiment may result in a graph indicating exponential growth ... we can say that the equation of the straight line is \(y = mx + 6\). Now we need to find the gradient.

This means that, using Pythagoras’ theorem, the equation of a circle with radius \(r\) and centre (0, 0) is given by the formula \(x^2+ y^2= r^2\). Find the equation of a circle with radius 3 ...