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-First of all add these two equations together so that the y s get eliminated. 5x=15 x=3 Since you have found the answer to x which is 3, substitute x into the equation 2x+y=7. 2*3+y=7 6+y=7 Therefore y=1 an...

Factors of a number are: numbers that can be multiplied (by a whole number/ integer) to make the original number. For example, 6 is a factor of 42, because 6 can be multiplied by 7 to make 42. Prime numbers ...

First of all, it is most important to define the key terms in the question. For example, lets look at the question ' How successful were the changes made to Tudor government finances in the years 1536-53?' T...

If a source is reliable, then what it tells us is likely to be accurate and very close to the truth of what actually happened. In order to determine the extent of a source's reliability, it is easier to brea...

For two linear simultaneous equations, two algebraic methods can be used to find solutions.The first is elimination, which is usually a lot quicker. Elimination involves subtracting one equation form the oth...