Question

What is the relationship in which the ratio of the manipulated variable and the responding variable is constant?
A. inverse proportion
B. direct proportion
C. slope
D. interdependent

Answer 1

A real world example - Ohm's Law:

V=IR

Let R be constant.
V is the responding variable
I is the manipulated variable.
V is DIRECTLY PROPORTIONAL to I (given R is constant). As I goes up, V goes up proportionally.

Answer 2

Inversely proportional would be something more like this:

\[Fg = G \frac{ M _{1}M _{1} }{ r ^{2} }\]

Fg is inversely (well, inverse-squared) proportional to the radius r.

Answer 3

So the answer would be (B) direct proportion.