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The key rule is to always remember that whatever you do on one side of the equal’s sign of the formula, you have to do to the other side. Make sure all the x terms within the formula are on one side of the equals sign and then manoeuver the equation in a way which isolates the x on its own. It’s better explained with an example; 

Make x the subject of the following formula: 5x+7=3x+2y

1. Make sure all the x’s are on one side. 

(5x-3x)+7=2y

2. Isolate the x’s 

2x=2y-7

3. Divide through by the number before x if there is one. 

x=(2y-7)/2

Hope that helps. 😊

Maths

How do you make x the subject of a formula ?

Here you can use the suvat equations. 

What we know; 

S (displacement)=?
U (initial velocity)=0
V (final velocity)= what we’re trying to find
A (acceleration)=15m/s2
T (time)=2seconds 

We then use the formula which includes the variables that we have which is; 

V=U+AT

Therefore; 

V=0+(15)(2)
V=30m/s 

Therefore the velocity of the car is 30m/s 

Hope that helps! 


Mo 

Mohammad Mohsen

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Queen Mary University of London

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Mohammad Mohsen