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To work out simultaneous equations, the aim is to remove one letter from the equations, i.e. Remove the y's so you have only x's and numbers (or vice versa).

One way to do ...

Several factors contributed to the rise of Hitler during the early 20th century, culminating in his domination of Germany, and the collapse of the Weimar Republic. Firstly it is important to consider the ...

We need to have either the same number of x's or the same number of y's in each equation so that we can add or subtract them to be left with just x or just y. We can do this by multiplying the second e...

Indirect taxes are imposed on expenditure. They raise a firm's cost of production, which causes an upward shift in the supply curve of the firm. Indirect taxes can be specific or ad valorem: specific t...

Firstly we must figure out what we know about this particle. We have its stangeness which is 1 and we know its charge from the "+" symbol in the question, which is also 1.For the first bit we sh...