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Which graph shows a proportional relationship between x and y? Please help me explain it and what's the answer A,B,C,D

Which graph shows a proportional relationship between x and y? Please help me explain-example-1

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Every proportional relationship is an equation like y = a number times 'x'. When you graph that equation it's a straight line that goes through the origin and every point on the line satisfies the equation. Line B is the only graph that looks like that. The others all have a piece of a proportional relationship. Their bottom pieces are proportional relationships but then they break and the top pieces are not.
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