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The first step to eliminate one of the unknowns, in this case x or y. This can be done by making the coefficient (the number before) of one of the unkowns the same number...

We are going to try to eliminate one of the variables in one of the equations. This can be done by rearranging the second equation to x=20-4y. And then substituting x into the first equation.3x+2y=20 =>...

We need to convert the number 67,854 (XX,XXX) to the form XX,000. We need to round it to the nearest thousand. The digit for the thousand is 7, so we move on to the digit on its right, which is 8.Now, if ...

x³-x=x(x²-1)=x(x+1)(x-1)

This is a question you may be asked in an Oxbridge interview for a course with any mathematical aspect. They are expecting you to find an answer without a calculator, but more importantly than finding the...