Solve the system of equations and choose the correct answer from the list of options. (4 points)

x − y = 7
y = 3x + 12

a
2 over 19 comma 2 over 33

b
negative 2 over 19 comma negative 33 over 2

c
negative 19 over 2 comma negative 33 over 2

d
19 over 2 comma 33 over 2