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First, write out the equations beneath each other: 4x + y = 14 6x - y = 16 Then, label the equations a and b (let's take the top one as a, and the bottom one as b) We always look to eliminate either the x te...

Merely memorising a set text is neither fun nor advisable as you could be given any section in the exam. To really understand what the author means, as well as be able to translate it, you should read the La...

Unlike the English language where one verb 'to know' is sufficient, it can be quite difficult to remember which one to use in French. So here are some simple rules to get you started! Firstly, let's look at ...

Sound waves have mass, as they are the longitudinal (along the path of the wave) vibration shockwave of molecule, while light waves do not, as they are the transverse displacement of just energy. Sound waves...

Take any polynomial, eg/ y=x 3 + 1 / 2 x 2 -3x+9. Then dy / dx =3x , +x-3, in this case. This is because, when deriving in this sense, you take each term in x, multiply it by its index, and reduce that index...