3. Make x the subject of the following formulae

y = (7 x)/14 b. y = (5x 1)/(x - 1)

a)y=7x/14

. 14y=7x (first multiply both sides by 14)
. 14y/7=x (then divide both sides by 7)

b) y=(5x+1)/(x-1)

. y(x-1)=(5x+1)
. Yx-y=5x+1
. Yx-5x=y+1
. x(y-5)=y+1
. x=(y+1)/(y-5)