make x the subjectWatch
To make x the subject, you need to 'move' the -5 from the right hand side of the equation onto the left hand side.
We do this by adding 5 to both sides. This is because -5 + 5 = 0 and so we will simply be left with: y + 5 = x + 0 which is the same as y+5 = x. This is the right answer, but we usually prefer to write it as x = y+5.
Now try making x the subject of the following:
(1) y = x + 2
(2) y = 2 - x
(3) 2y + 3 = 2x -1
Now we have to make X, the subject
If something is divided by another thing and you wish to make the whatever is on the top the subject, in this case X. You simply multiply the bottom to each side of the question.
X =(A^2) (3B) (2C)