Question

x y 2 5 4 10 6 15 not direct variation direct variation equation:

Explanation:

Step1: Check direct variation condition

Verify if $\frac{y}{x}$ is constant.
$\frac{5}{2}=2.5$, $\frac{10}{4}=2.5$, $\frac{15}{6}=2.5$

Step2: Define direct variation equation

Direct variation follows $y=kx$, where $k=2.5$.
$y=2.5x$ or $y=\frac{5}{2}x$

Answer:

Direct variation
Equation: $y=\frac{5}{2}x$