Fit Linear Models to Scatter Plots Practice Test

A school club tracked how many posters they hung and how many students signed up. The scatter plot shows a positive linear association. Two representative points are marked: $(2, 18)$ and $(8, 54)$, where $x$ is posters and $y$ is sign-ups.

Estimate the slope of a reasonable line of best fit (in sign-ups per poster).

A car’s stopping distance ($y$, in feet) was measured at different speeds ($x$, in mph). Over this limited range, the relationship appears approximately linear.

Which equation best models the relationship between speed and stopping distance?