Question

y = 9x + 4 (13,121) (4,40) use the equation of the trend line to predict the number of books sold in 14 days. ? books number of books sold number of days

Explanation:

Step1: Identify the equation

The trend line equation is \( y = 9x + 4 \), where \( x \) is the number of days and \( y \) is the number of books sold.

Step2: Substitute \( x = 14 \)

Substitute \( x = 14 \) into the equation: \( y = 9(14) + 4 \)

Step3: Calculate the value

First, calculate \( 9(14) = 126 \), then add 4: \( 126 + 4 = 130 \)

Answer:

130