# Further maths

posted by Zainab

The 8th term of a linear sequence is 18th and the 12th term is 26th .find the first term,common difference and the 20th term

1. Reiny

Your question does not make sense
"The 8th term of a linear sequence is 18th"
= gobbledegoop!
In any arithmetic (linear) sequence, the terms either increase or decrease. A term can never repeat itself
if you meant:
The 8th term of a linear sequence is 18 , we can do something

Correct your question, and we'll go from there.

2. Reiny

a+7d = 18
a+11d = 26
subtract them:
4d = 8
d = 2

in a+7d = 18
2+7d = 18

carry on

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