AB = AC AB = 4x-2 AC = 2x+12 Substitute 4x-2 for AB and 2x+12 for AC in AB = AC 4x-2 = 2x+12 Add 2 to both sides 4x = 2x+14 Subtract 2x from both sides: 2x = 14 Divide both sides by 2 x = 7 Substitute 7 for x in BC = 4x-3 BC = 4(7)-3 BC = 28-3 BC = 25 Edwin