Select the action you would use to solve 3x = 12. Then select the property
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Answer:
<h2>The constant of proportionality is 0.50</h2>Step-by-step explanation:
The constant of proportionality is the unit ratio between variables.
According to the problem, Marie pays $2.50 for 5 pencils. So, the unit ratio os this would be the constant of proportionaliy. To find it, we just need to divide.
Therefore, the constant of proportionality is 0.50, which means Marie paid $0.50 per pencil.