We have the explicit equatiion:
The 8th term is 78
y = 10 * 8 - 2
y = 80 - 2
We replaced x by 8
Therefore, for finding the 9th term, we calculate the value this way:
y = 10 * 9 - 2
y = 90 - 2
y = 88
The 9th term of the series is 88
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