How do you solve simultaneous equations?

A simultaneous equation is when we have 2 equations which both have X and Y in them. The best way to solve these equations is to rearrange one of them to make either X or Y the subject, and then substitute it into the other equation. This gives you an equation with just one of X and Y in it which you can easily solve by expanding brackets and rearranging. This will tell you what either X or Y is equal to, which can then be substituted back into one of the starting equations to find the other term.

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Answered by Charlie N. Maths tutor

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How do I solve simultaneous equations?


Solve the simultaneous equations: 2x + y = 18 and x - y = 6


Rearranging algebraic formula- make a the subject of the formula.


There are 30 balls in the bag, 10 of which are blue. Adam takes 2 balls out of the bag without a replacement and calculated that there is a probability of 0.2 of both balls being blue. What percentage error did he make compared to the true probability?


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