Question

$y$ varies directly as $x$ and $y=40$ when $x=15$, find the constant of variaton

Answer 1

Given, $y=40,x=15$
Given proportion is $y\propto x$
$\Rightarrow y=kx$
Constant of variation, $k=\frac{y}{x}=\frac{40}{15}=\frac{8}{3}=2.67$