Question

The following scatter diagram shows two sets of data, x and y, that show high negative correlation: Which of the following gives the most accurate answer for the equation of the line of best fit?

• A. $y=-x+8$
• B. $y=-2x+8$
• C. $y=-2x+9$
• D. $y=2x+8$

Answer 1

Answer: (B)

$y=-2x+8$

At $x=0.5,y=7$

$x=3.5,y=1$

$(y-7)=\frac{7-1}{0.5-3.5}(x-0.5)$

$y-7=-2x+1$

$y=-2x+8$

$\therefore y=-2x+8$ is the line of best fit.