Question

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Answer 1

a(200) = 8x200 + 7
a(200) = 1607

Answer 2

Simplifying

an = 8n + -7

Reorder the terms:

an = -7 + 8n

Solving

an = -7 + 8n

Solving for variable 'a'.

Move all terms containing a to the left, all other terms to the right.

Divide each side by 'n'.

a = -7n-1 + 8

Simplifying

a = -7n-1 + 8

Reorder the terms:

a = 8 + -7n-1