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The answer is a proof so is best shown during the interview via the whiteboard. For reference this question was in the news a few years ago and was considered difficult for GCSE students at the time.

Firstly, we need to make 'x' the subject of the equation. We do this by 'moving' everything that isn't an x over to the other side of the equation. When we do this, the main thing to remember is that what...

To solve using elimination, you need to use the following four steps:Step 1: make sure that both of the equations have opposite x terms or opposite y terms. Currently neither of the x terms in the two equ...

1. the x squared is counted as A, the 6x is counted as B and -10 is C2) you halve the B term so in this case it would be 3x from the 6x and write it with an x in a bracket squared e.g. (x+3)^23) then y...

The first step of solving simultaneous equations with two unknown variables (m & n in this case) is to rearrange one of the equations so that we get one variable in terms of the other. Lets take the f...