HELP PLEASE ITS A TEST AND DUE TODAY, {help with both questions

 5.) First One) Ratified in 1870, the 15th Amendment to the U.S. Constitution declared, “The right of citizens of the United States to vote shall not be denied or abridged by the United States or by any state on account of race, color, or previous condition of servitude.” While this amendment, passed in the wake of the Civil War, granted suffrage to African ..

6.) Second one)Soon after the Civil War, southern states governed by Presidential Reconstruction (1865-67) adopted racially discriminatory laws, called "black codes," to maintain close control over the newly freed slaves, thereby retaining as much of the elements of slavery as possible.

Explanation:

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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