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Which system of linear equations has an infinite number of solutions?
a. 3 x + 8 y = -1
3x + 8y = 2
b. 3 x + 8 y = -1
-3x + 4y = -20
c. 3 x + 8 y = -1
-12x - 32y = 4
d. 3 x + 8 y = -1
-2x + y = 3