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What is the graph of two variables that are directly proportional to one another?

User Gokcand
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The graph is a straight line that passes through the origin.

For instance, the linear equation y = 6x is a direct proportion.

If the line doesn't pass through the origin, then it's not a direct proportion. The equation y = 2x+5 for instance is not a direct proportion.

User Aetherus
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