50 POINTS
Which of the following tables represents a linear relationship that is also proportional?
1.
x −3 0 3
y 0 2 4
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2.
x −4 −2 0
y −2 0 2
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3.
x −4 0 4
y 1 0 −1
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4.
x −1 0 1
y −5 −3 −1