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| Change of subject of formula |
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In the formula  I is called the subject of the formula. |
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| To make 'P' the subject of the formula: |
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| P x T x R = 100 x I |
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If  make 'a' the subject of the formula. |
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| m(a + b) = a Cross multiplying. |
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| am + bm = a |
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| am -a = - bm Take terms containing 'a' to one side. |
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| a(m - 1) = -bm remove 'a' as a common factor. |
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| [Note: Sign is changed in both the numerator and the denominator] |
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If  make 'y' the subject of the formula. |
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 Squaring both sides |
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| ma2 = xy |
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 i.e.,  |
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It is given that  |
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| (i) Make b the subject of the formula. |
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| (ii) If a = 9 and R = 3, find b. |
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(i)  |
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 (Invertendo) |
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| [Note: Invertendo means inverting the ratios.] |
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(ii)  |
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