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Plant A is 18 inches tall after one week, 36 inches tall after two weeks, 56 inches tall after three weeks. Plant B is 18 inches tall after one week, 36 inches tall after two weeks, 54 inches tall after three weeks. Which situation represents a proportional relationship between the plants' height and number of weeks?

Respuesta :

Plan B

You take the inches and divide by the weeks to see if it is proportional.  18 x 2 is 36, so both are proportional at that point.  

18 x 3 is 54. 

Only B is proportional at that point.

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