Which system of equations is equivalent to the following system? (5 points) 2x + 4y = 14 4x + y = 20

a.2x + 4y = 14
−16x − 4y = −80

b.2x + 4y = 14
−4x + y = −20

c.4x + 8y = −28
4x + y = 20

d.−2x − 4y = 14
4x + y = 20