SAT Question 4cc05491: Two-variable Data Models And Scatterplots answer and explanation with Desmos solution

Choice C is correct. A line in the xy-plane that passes through points $\left(x_1,y_1\right)$ and $\left(x_2,y_2\right)$ has a slope of $\frac{y_2-y_1}{x_2-x_1}$. The line of best fit shown passes approximately through the points $\left(0,0.2\right)$ and $\left(5,9.3\right)$. It follows that the slope of this line is approximately $\frac{9.3-0.2}{5-0}$, which is equivalent to $\frac{9.1}{5}$, or $1.82$. Therefore, of the given choices, $1.8$ is closest to the slope of the line of best fit shown.