What element of the federal gov is established by article 3 of the constitution

Article III of the Constitution establishes the judicial branch of the federal government. This article grants the judicial power of the government to the Supreme Court and allows inferior courts that Congress may create from time to time. It also explains the powers of federal courts and specifies treason

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the perimeter of a triangle is 69 cm. side a is 5 cm shorter than side b. side c is twice as long as side a. find the length of each side. i need to know how to do it in 2 equations.  

equations:

a = b-5

c = 2a

a + b + c = 69