A student is trying to solve the system of two equations given below:
equation P: y + z = 6
equation Q: 5y + 9z = 1
Which of the following is a possible step used in eliminating the y-term?
A: (y + z = 6) × 9
B: (y + z = 6) × -5
C: (5y + 9z = 1) × 9
D: (5y + 9z = 1) × 5