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What is the value of y in the arithmetic sequence y + 6, 12, 3y?

 Dec 26, 2021
 #1
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y + 6  + d  = 12

   so   d = 6-y

 

12 + d = 3y

 d = 3y-12

 

equate the d's    (red equations)

6-y = 3y-12

4y = 18

 y = 4.5

 Dec 26, 2021
 #2
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Just to add that "d" in the above stands for the difference between terms in the arithmetic sequence.  

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Guest Dec 26, 2021

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