Which answer is the best estimate of the residual value when x = 5? −1.5 −0.5 0.5 1.5

I took the test, (for this particular graph) it was -1.5.

for finding the midpoint of any given 2 pair of points simply add the respective x coordinates with other x coordinate and the y coordinate with other y coordinate and divide them by 2

in your question it will be :

(3+1)/2 for the x coordinate of mid point i.e 2

[8+(-4)]/2 for the y coordinate of midpoint i.e 2

so coordinates of mid point of points (3,8) and (1,-4) will be (2,2)

the balance is found at the link

step-by-step explanation: