X+8=y-1
z+13=x+16
y–12=z–6

solve for x,y,z using system of equations

Under the Constitution, the President of the United States determines U.S. foreign policy. The Secretary of State, appointed by the President with the advice and consent of the Senate, is the President’s chief foreign affairs adviser. The Secretary carries out the President’s foreign policies through the State Department and the Foreign Service of the United States.

Created in 1789 by the Congress as the successor to the Department of Foreign Affairs, the Department of State is the senior executive Department of the U.S. Government. The Secretary of State’s duties relating to foreign affairs have not changed significantly since then, but they have become far more complex as international commitments multiplied. These duties -- the activities and responsibilities of the State Department -- include the following:

Serves as the President's principal adviser on U.S. foreign policy;

Conducts negotiations relating to U.S. foreign affairs;

Grants and issues passports to American citizens and exequaturs to foreign consuls in the United States;

Advises the President on the appointment of U.S. ambassadors, ministers, consuls, and other diplomatic representatives;

Advises the President regarding the acceptance, recall, and dismissal of the representatives of foreign governments;

Personally participates in or directs U.S. representatives to international conferences, organizations, and agencies;

Negotiates, interprets, and terminates treaties and agreements;

Ensures the protection of the U.S. Government to American citizens, property, and interests in foreign countries;

Supervises the administration of U.S. immigration laws abroad;

Provides information to American citizens regarding the political, economic, social, cultural, and humanitarian conditions in foreign countries;

Informs the Congress and American citizens on the conduct of U.S. foreign relations;

Promotes beneficial economic intercourse between the United States and other countries;

Administers the Department of State;

Supervises the Foreign Service of the United States.

In addition, the Secretary of State retains domestic responsibilities that Congress entrusted to the State Department in 1789. These include the custody of the Great Seal of the United States, the preparation of certain presidential proclamations, the publication of treaties and international acts as well as the official record of the foreign relations of the United States, and the custody of certain original treaties and international agreements. The Secretary also serves as the channel of communication between the Federal Government and the States on the extradition of fugitives to or from foreign countries.