## Algebra and Trigonometry 10th Edition

$y=\frac{5}{2}x$
As $x$ increases, $y$ increases too: $y=kx$ Now choose any point. Let's use $(10,4)$: $4=k(10)$ $k=\frac{4}{10}=\frac{5}{2}$ The variation model: $y=\frac{5}{2}x$