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3y - x = 12 (1)y + 2x = -3 (2)multiply equation (2) by 3: 3y + 6x = -9 (3)subtract equation (1) from equation (3): 3y + 6x - 3y + x = -9 -12 7x = -21 x = -3substitute x into equation (2): y -6 = -3 y = 3a...

the rule for differentiating in terms of x is to multiply by the power then decrease the power by one. So going through the equation x^3 will be multiplied by 3 and go to x^2 so will be 3x^2. Then its imp...

Firstly, we need to add up how many 'parts' this money is being split into by adding the ratio, 3+4+1 = 8 parts. Now we need to calculate how much one part is equal to by splitting our £300 into the 8 par...

So you have a molecule which is full of electrons, and at any moment in time these electrons can move to one side of the molecule. As we know electrons are negatively charged, if they suddenly move to on...

Everyone revises differently, but I found that once I had a good knowledge of the text, the most helpful thing for me was to lay my ideas out visually and do something besides just reading my notes. I wou...