If (y - 1)(z + 1) + 4(z - 3) = 0, then which of the following must be true?  Select:
A) y = -4 and z = -3  B) y = 4 or z = -3  C) y = -4 or z = 3  D) y = 1 and z = 3  E) y = 1 or z = - 3
yz + y - 2z - 1 + 4z - 12 = 0   yz + y + 3z - 13 = 0   yz + y + 3z = 13   So by checking options we get ,   y = 1 and z = 3.
<result>D</result>
If (y - 1)(z + 1) + 4(z - 3) = 0, then which of the following must be true?