Question

which expression can be simplified to find the slope of the trend line in the scatterplot?

Explanation:

Identify points on the trend line

$$ (x_1, y_1) = (4, 21),\quad (x_2, y_2) = (8, 35) $$

Apply the slope formula

$$ m = \frac{y_2 - y_1}{x_2 - x_1} = \frac{35 - 21}{8 - 4} $$

Answer:

The expression that can be simplified to find the slope of the trend line is:

$$\frac{35 - 21}{8 - 4}$$