Question

solving and writing about equations of trend lines
monthly sales & advertising costs
the scatterplot and trend line show a positive
correlation between advertising costs and sales.
which two points can be used to find the slope of the
trend line?
point 1:
point 2:
(6.5, 122)
(6.6, 120)
(6.7, 121)
x (6.9, 123)

Explanation:

Step1: Understand the concept of trend line

The trend line is a line that best represents the data on a scatter - plot. To find the slope of a line \(m=\frac{y_2 - y_1}{x_2 - x_1}\), we need two points \((x_1,y_1)\) and \((x_2,y_2)\) that lie on the trend line.

Step2: Identify points on the trend line

Looking at the scatter - plot and the trend line, the points \((6.5,122)\) and \((6.9,123)\) are on the trend line.

Answer:

Point 1: \((6.5,122)\), Point 2: \((6.9,123)\)