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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 these is a possible step used in eliminating the y-term?

Select one:
a. (y + z = 6) ⋅ 9
b. (y + z = 6) ⋅ −5
c. (5y + 9z = 1) ⋅ 9
d. (5y + 9z = 1) ⋅ 5