Save guides, add subjects and pick up where you left off with your BBC account. To find the equation of a circle when you know the radius and centre, use the formula \({(x - a)^2} + {(y - b)^2} ...

Solve the simultaneous equations \(x + y = 5\) and \(y = x + 1\) using graphs. To solve this question, first construct a set of axes, making sure there is enough room to plot the two graphs.

A solution to any series of equations can be found by graphing both equations and finding out where they meet. Simultaneous differential equations are no different; in order to find out the ...