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Below are some case situations on EXTINGUISHMENT OF OBLIGATIONS. Can you answer them? (with explanation and if possible provide the related law article)

- X and Y were co-owners of a piece of property worth P1O million. For some repairs thereon, Y paid P2,000,000. Because they were co-owners, X had to share in said expenses, and so X owed Y P1,000,000. X sold his share in the property to Z and Y also sold his share in the property to Z. later, Y brought an action to recover, P1,000,000 from X. X claimed that since Z is now the owner of the property, Z owes himself, and therefore said merger had extinguished his debt to Y. should X pay Y?
- X owes Y P50,000. Z is the guarantor of X. Y owes X P10,000. When Y sues X and X cannot pay, for how much will Z be liable?
- X owes Y P50,000. Z is the guarantor of X. Y owes Z P50,000. When Y sues X for the P50,000, may X successfully put up the defense of compensation in that, after all, his creditor (Y) owes Z the same amount?
- X owes Y P100,000. Y owes X P20,000. Both debts are already due. Later Y, with the knowledge but without the consent (or against the will) of X, assigned the P100,000 credit to Z. how much can Z successfully collect from X?
- X owes Y P10 million due on April 2; Y owes X P2,000,000 due also on May 4. On March 8 (when there was no legal compensation yet), Y assigned his P10 million credit to Z, with the knowledge but without the consent of X. on april 2, how much Z can successfully collect from X?