a = 5, b = 14
a = -5, b = 14
a = 5, b = -14
a = -5, b = -14
Correct answer is B
The terms of the sequence can be written as : ur=ar+b in this case, being that they have a regular common difference for each of the r terms.
We can rewrite the sequence as a+b,2a+b,3a+b,... where a is the common difference of the sequence and b is a given constant gotten by solving
a+b=9 or 2a+b=4 or any other one.
The common difference here is 4 - 9 = -1 - 4 = -5.
−5+b=9⟹b=9+5=14
∴ The equation can be written as u_{r} = -5r + 14.
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