Answer:
C
Explanation:
Constant of proportionality means slope which can be represented as y=mx+b, y=kx and a ton of other stuff I don't know.
But lets take it as y=kx because it's easier. Constant of proportionality/slope is k so its C, 5.5.
The constant of proportionality is the constant value of the ratio of two proportional quantities x and y, typically the equation is Y=KX. ... The constant of proportionality does is, the value of Y is dependent on how the given value of X is effected by the constant of proportionality.
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