The right answer is the constant of proportionality
If two variables are related and this relationship is that there is a constant ratio between them, then we are talking about proportionality. There are two types of proportionality.
1) Direct Proportionality:
In a mathematical language this is given by this equation:
[tex]y=kx[/tex]
where [tex]k[/tex] is in fact this constant of proportionality. If [tex]x[/tex] increases, [tex]y[/tex] also increases at the same rate. On the other hand, If [tex]x[/tex] decreases, [tex]y[/tex] also decreases at the same rate.
2) Inverse Proportionality:
In a mathematical language this is given by this equation:
[tex]y=\frac{k}{x}[/tex]
where [tex]k[/tex] is also called the constant of proportionality. If [tex]x[/tex] increases, [tex]y[/tex] decreases at the same rate. On the other hand, If [tex]x[/tex] decreases, [tex]y[/tex] increases at the same rate.
