# make x the subject

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#1
y=x-5 rearrange the formulae to make x the subject
0
3 years ago
#2
x=y+5
1
3 years ago
#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
3 years ago
#4
The topic for this is "rearranging forumulae", this is fairly simple.
0
3 years ago
#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
2
10 months ago
#6
X/a(squared) 3b = 2c Make x the subject
0
10 months ago
#7
I need help with it for my homework I don’t understand
0
10 months ago
#8
(Original post by Hello hshsb)
X/a(squared) 3b = 2c Make x the subject
x = (2a^2 * c) / 3b

sorry I can't quite explain what I did as I just did it in my head but it's about dividing anything on the left of the = to get X on it's own
0
10 months ago
#9
X/3bA^2 = 2c... The question, just rearranged so it's simpler to think out.

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)
=6A^2BC
0
6 months ago
#10
0
5 months ago
#11
(Original post by Filipina.x)
xy-x=0
x(y-1)=0
x=0

right?

shoreyr015
Unless y = 1 as then x = x
1
5 months ago
#12
XY=X+A
why is this confusing me? help!
0
5 months ago
#13
(Original post by shoreyr015)
XY=X+A
why is this confusing me? help!
Take your x’s to one side
xy-x=a

Factorise
x(y-1)=a

Bring y-1 to the other side through division
x=a/y-1
Last edited by Filipina.x; 5 months ago
0
5 months ago
#14
(Original post by Filipina.x)
Take your x’s to one side
xy-x=a

Factorise
x(y-1)=a

Bring y-1 to the other side through division
x=a/y-1
Thank you! That makes so much sense no idea why I was so confused
0
4 months ago
#15
0
4 months ago
#16
(Original post by Harryacko)
y=x-5 rearrange the formulae to make x the subject
x=y+5
0
2 months ago
#17
(Original post by Rohit_Rocks10)
Are you a troll??? Even my 4 year old cousin brother can do this!!!
Well it's x=y+5
shut the **** up Rohit you cheeky ****ing yute ill snap your nan in half like the ****in undertaker you ****ing neek
0
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