The interior angles of a triangle will always add up to 180. This means that 3x-14+3x+9+ angle BAC = 180 To find angle BAC, we have to subtract 103 from 180 (Because an exterior angle is equal to the sum of two opposite interior angles, and we know the exterior angle is 180 and one interior angle is 103) This is 77 Now we solve 3x-14+3x+9+77 = 180 First, collect all like terms 6x+72=180 Next, subtract 72 from both sides 6x=108 Then, divide both sides by 6
