Find and interpret the constant of proportionality in multiple representations.
Find k from an equation
Problem
The equation \(y~=~2.5x\) represents a proportional relationship. What is the constant of proportionality, \(k\)?
Big Picture
What this problem is really about
The equation is already written in the proportional form y equals k times x. We’ll match each part of the given equation to that template and identify the numerical coefficient attached to x, without taking its reciprocal or moving the decimal. Substituting one for x checks that this coefficient is the output per one input unit.
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