Graph Proportional Relationships Practice Test

A runner’s distance $y$ (in miles) is proportional to time $x$ (in hours) and is modeled by $y=6x$. What does the slope (the 6) represent?

A proportional relationship is graphed on the coordinate plane. The line goes through $(0,0)$ and $(2,10)$. What is the unit rate (slope) $k$ in $y=kx$?