Equilateral triangle means that all the sides equal the same. So 6x = 4x+8 = 3x+12 now we choose two sides and solve for x 6x = 3x + 12 subtract 3x from both sides 3x = 12 divide both sides by 3 x = 4
Now we can substitute it in to check 6x = 4x+8 = 3x+12 6(4) = 4(4) + 8 = 3(4) + 12 24 = 16 + 8 = 12 + 12 24 = 24 = 24
