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https://vle.mathswatch.co.uk/images/questions/question17515.png

 May 5, 2020
 #1
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Not too difficult....

 

Just sub  4  into each x  in the equations  and see which one is true

 

Note  that  C appears to be correct  !!!

 

cool cool cool

 May 5, 2020
edited by CPhill  May 5, 2020

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