The creation of the european union (eu) and of
the north american free trade agreement
(nafta) was intended to
(1) benefit member nations through the
reduction of tariffs
(2) implement sustainable energy policies
(3) institute a system of impartial courts
(4) establish stronger regional military alliances

the second significant cause of the great migration was the desire of black southerners to escape segregation, known euphemistically as jim crow. rural african american southerners believed that segregation - and racism and prejudice against blacks - was significantly less intense in the north.

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