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

 Jun 9, 2021
 #1
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y+6+x=12, y+x=6

12+x=3y, 3y-x=12

4y=18

y=9/2

 

JP

 Jun 9, 2021
 #2
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$(y+6) + n = 12$

$12 + n = 3y$

$y + n = 6$

$n = 3y - 12$

$y + (3y - 12) = 6$

$4y - 12 = 6$

$4y = 18$

$\boxed{y = 4.5}$


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