# Direct variation

• January 6th 2009, 05:55 PM
tupac
Direct variation
y varies directly as (x+5) and f(2)=3. Set up the Equation
• January 6th 2009, 06:18 PM
skeeter
Quote:

y varies directly as (x+5)
translates to the equation $y = k(x+5)$ , where $k$ is the constant of proportionality

use $f(2) = 3$ to find $k$ ...

$3 = k(2+5)$

$k = \frac{3}{7}$

so, the function is $y = \frac{3}{7}(x+5)$