The data on the graph show the foot lengths and forearm lengths for a group of people. The line of best fit for the data is shown. Use the equation of the line of best fit to predict the length of a person’s forearm if the length of their foot is 8 inches.
A graph is labeled as Foot Length versus Forearm Length. The horizontal axis is labeled as Length of Foot left parenthesis inches right parenthesis and the vertical axis is labeled as Length of Forearm left parenthesis inches right parenthesis. The values on the horizontal axis range from 0 to 15 in increments of 1 and the values on the vertical axis range from 0 to 15 in increments of 1. Several points are scattered throughout the graph and a line is shown which passes between these points and the equation of the line is labeled as y equals 1 decimal point 1 1 x minus 0 decimal point 8 3.
A.
8.88 inches
B.
6.94 inches
C.
9.16 inches
D.
8.05 inches
I think the answer is 8.05
am i correct?
Disagree. Multiply 1.11 by 8 and subtract .83.
Yes you are correct it is D
To predict the length of a person's forearm if the length of their foot is 8 inches, we can use the equation of the line of best fit given in the problem: y = 1.11x - 0.83.
Here, "x" represents the length of the foot and "y" represents the length of the forearm.
To find the length of the forearm for a foot length of 8 inches, we substitute x = 8 into the equation:
y = 1.11(8) - 0.83
y = 8.88 - 0.83
y = 8.05 inches
Therefore, the predicted length of the person's forearm with a foot length of 8 inches is 8.05 inches.
The correct answer is D. 8.05 inches.
you have the equation of the line of best fit: y = 1.11x - 0.83
So, what is y if x = 8 ?