Change of subject of formula

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In the formula I is called the subject of the formula.In the formula I is called the subject of the formula.

To make 'P' the subject of the formula:

P x T x R = 100 x I

If make 'a' the subject of the formula.

m(a + b) = a Cross multiplying.

am + bm = a

am -a = - bm Take terms containing 'a' to one side.

a(m - 1) = -bm remove 'a' as a common factor.

[Note: Sign is changed in both the numerator and the denominator]

If make 'y' the subject of the formula.

Squaring both sides

ma² = xy

i.e.,

It is given that

(i) Make b the subject of the formula.

(ii) If a = 9 and R = 3, find b.

(i)

(Invertendo)

[Note: Invertendo means inverting the ratios.]

(ii)