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These are simultaneous equations. To solve them, we need to do something to these equations to that either the coefficents of x or y are the same. So multiply each equation by a suitable number,  a good c...

Relative clauses in Russian are created by using the relative pronoun 'который'. This pronoun has adjectival endings and refers to the noun that comes directly before it. It agrees with this noun in gende...

To start, it is important to have a clear understanding of what an enzyme is. An enzyme is a biological molecule which speeds up the rate of a reaction without being changed or used up in the process. Eac...

Solution: x=4. This can be shown by factorisation or applying the quadratic formula.

Most GCSE papers are split between a number of short answer questions worth a few marks and then one or two longer 'essay-style' questions which are worth considerably more. The key thing to focus on is e...