Question

Make a the subject of the formula:p=2a-3

Answer 1

To make a the subject we proceed as follows:
p=2a-3
add 3 on both sides
3+p=2a-3+3
simplifying the above gives us:
3+p=2a
divide both through  by 2
3/2+p/2=(2a)/2
thus
a=3/2+p/2