# ABC Equilateral Triangle

• May 31st 2010, 05:59 PM
Tren301
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. (Rofl)
• May 31st 2010, 06:22 PM
undefined
Quote:

Originally Posted by Tren301
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. (Rofl)

$x+3y-8 = 2x+y+3$

$x = 2y - 11$

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

$4x = 4y - 16$

$x = y - 4$

$2y - 11 = y - 4$

$y = 7$

$x = y - 4$

$x = 3$

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