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16 October, 17:01

Roni wants to write an equation to represent a proportional relationship that has a constant of proportionality equal to 7/25. She writes the equation y = x + 7/25. What error is Roni making?

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  1. 16 October, 17:29
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    Roni did not make use of the equation for a proportional relationship.

    Step-by-step explanation:

    For some constant of proportionality k, y is proportional to x if x and y satisfy the equation ...

    y = kx

    Roni knows k=7/25, but she did not use this equation. She added instead of multiplying, so did not end with an equation expressing a proportional relation.

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    y = (7/25) x
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