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Math Help - ABC Equilateral Triangle

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    ABC Equilateral Triangle

    Find the lenght of a side of an Equilateral Triangle with sides with the following equations;

    (x+3y-8)cm
    (2x+y+3)cm
    (5x-y+8)cm

    Thanks.
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    Quote Originally Posted by Tren301 View Post
    Find the lenght of a side of an Equilateral Triangle with sides with the following equations;

    (x+3y-8)cm
    (2x+y+3)cm
    (5x-y+8)cm

    Thanks.
    x+3y-8 = 2x+y+3

    x = 2y - 11


     x+3y-8 = 5x-y+8

     4x = 4y - 16

     x = y - 4


     2y - 11 = y - 4

     y = 7


     x = y - 4

     x = 3


     s = x+3y-8 = 3 + (3)(7) - 8 = 16\ \text{cm}
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