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Prove that if ? ≡ ? (mod n) and ? ≡ ? (mod n), then ?...

Prove that if ? ≡ ? (mod n) and ? ≡ ? (mod n), then ? ≡ ? (mod n). This proves that congruence mod n is transitive.

and

: Prove that if ? ≡ ? (mod n) and ? ≡ ? (mod n), then

  1. a) ? + ? ≡ ? + ? (mod n)

  2. b) ?? ≡ ?? (mod n)

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