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# make x the subject watch

1. y=x-5 rearrange the formulae to make x the subject
2. x=y+5
3. (Original post by Harryacko)
y=x-5 rearrange the formulae to make x the subject
Are you a troll??? Even my 4 year old cousin brother can do this!!!
Well it's x=y+5
4. The topic for this is "rearranging forumulae", this is fairly simple.
5. (Original post by Harryacko)
y=x-5 rearrange the formulae to make x the subject
"To make x the subject" means to have an equation with all the terms in x on one side.Currently, y is the subject of the equation.

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

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Updated: February 7, 2017
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