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| Summary |
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 In a given sentence, the variables are replaced by letters and the different operations are replaced by their mathematical symbols. We now arrive at a formula. |
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If a formula gives 'x' in terms of the other variables, x is called the subject of the formula. |
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When ever a formula is given and we have to make a particular variable as the subject of the formula, we should express that variable in terms of the other variables. |
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| For example in 2x = y + 7k, x is the subject of the formula. If we want to make 'y' as the subject we should change it as y = 2x - 7k. |
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