Which of these systems of equations has infinitely many solutions? Explain how you know.
a. y = 3x – 6
y = 3(x - 2)

b. y = 5x +10
y = -5x + 10

c. y = 6x +18
y = 6x - 18

d. y = 3x + 12
y = 3(x + 9)

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