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When two variable quantities have a constant (unchanged) ratio, their relationship is called a direct variation. It is said that one variable "varies directly" as the other.

The formula for direct variation is

For example:

The weekly salary of a girl earns,

The answer is: S = hk or \frac{s}{h} = k[/tex]

The formula for direct variation is

**y = kx**, where**k**is the constant of variation. "**y**varies directly as**x**"For example:

The weekly salary of a girl earns,

**S,**varies directly as the number of hours,**H,**which she works. Express this relation as a formula.The answer is: S = hk or \frac{s}{h} = k[/tex]

1) The voltage (V) of an electric circuit varies directly as the current (I), where R (resistance is constant)

V = R × I or V=RI

2) Hooke's law in physics states that the extension (S) of a spring varies directly as the applied force (F), where k is the constant of variation

S = kF

3) The interest (I) payable on a given loan varies directly as the time (t) for which the loan is made, where k is the constant of variation.

I = kt