Here are the vocabulary words matched with their definitions/meanings:
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Rate of change - rate that describes how one quantity changes in relation to another quantity
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Y-intercept - the point where the graph intersects the y-axis
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Unit rate - a rate for one of something
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Positive slope - y-values are increasing as x-values are increasing from left to right
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Negative slope - y-values are decreasing as x-values are increasing from left to right
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Slope - the steepness of a line as it moves from left to right
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Proportional relationship - all the ratios of the variables are equivalent/equal
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Non-proportional relationship - the ratios of the variables are not equivalent/equal
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Difference in y - (not specifically matched in the definitions, but can imply the change in output)
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Difference in x - (not specifically matched in the definitions, but can imply the change in input)