Search and seizure restrictions are listed in the what amendment

The Fourth Amendment is a constitutional amendment that protects people in the United States from arbitrary investigations and apprehensions. The amendment states the following: The right of the people to security in their persons, domiciles, papers and effects, against arbitrary searches and detentions, shall be inviolable, and guarantees should not be required, except for a probable cause, supported by an oath or affirmation and particularly describing the place to be registered and the person or things to be confiscated.

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