MAKING THE SUBJECT 1

If D = y(c + a)    make a the subject of the formula.

            (c – a)

Solution

  

D = y(c+ a)   

        (c – a)

(c – a) x D = y(c + a) x (w – a)¹   multiply by(w-a) on both sides.

                       (c – a)₁

(c – a) x D = y(c + a)

Dc – Da = yc + ya     [open the brackets on both sides].

Dc – yc = Da + ya   [collecting the terms containing a together]

Dc – yc = a(D + y)      [factoring a out on RHS]

Dc – yc = a(D + y) ¹               [Divide by (D + y) on both sides].

(D + y)         (D + y) ₁

Dc – yc = a

(D + y)        

Hence  a =   Dc – yc

                       D + y       

TRY THIS…………

If B = w(h + m)    make m the subject of the formula.

            (h – m)