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Yes, it does. Every time there are variables in direct or inverse relationship, there is a constant of proportionality.
Direct proportionality.
Proportionality is a rational or ratio property. Ratios are expressed with a colon. [:] Direct proportionality would be expressed as 1:1
It is the constant of proportionality.
When there is a direct proportionality y = kx y = 75 k = 15 → 75 = 15x → x = 75/15 = 5