Question

Make b the subject of the formula p=2a+b

Answer 1

bring 2a to the left side by subracting 2a to the p

p-2a=b

Answer 2

p=2a+b
-b      -b
p-b=2a
-p     -p
-b=2a-p
/-1    /-1
b=-2a+p

hope this helps =)