Question

Which linear equation BEST represents the line of best fit for the scatterplot?



A) y = 3x
B) y = - 3x
C) y = 1/3x
D) y = - 1/3x

Answer 1

it is D. it has a negative slope and is not as steep as -3

Answer 2

Answer:

option: D is true.

Step-by-step explanation:

The linear equation that Best describes or represents the line of best fit of the scatter plot is:

y=-3x.

Since clearly from the graph if we consider a line of best fit as a line passing through (0,0) and (-3,1).

Then we find the equation of line passing through these two points.

The equation of line passing through (a,b) and (c,d) is given by:

$y-b=\dfrac{d-b}{b-a}\times (x-a)$

Here we have:

(a,b)=(0,0) and (c,d)=(-3,1)

The equation of line is:

$y-0=\dfrac{1-0}{-3-0}\times (x-0)\\\\y=\dfrac{-1}{3}x$

Hence,  the linear equation BEST represents the line of best fit for the scatterplot is:

$y=\dfrac{-1}{3} x$

Hence, option D is true.