Answer :

4.

a.
2y=-1/2x+6
y=-1/4x+3

b.y=1/2x+5

c.
4y=-2x+12
y=-1/2x+3

d.
y=2x+4.

As a result, C is the answer because y=-1/2x+3 is also equal the equation C that make it had infinity solution. Hope it help!

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