Answer:
(-2 , 2)
Step-by-step explanation:
A(-8 , 2) = (x1 , y1)
B(4 , -2) = (x2 , y2)
midpoint = (x1 + x2/2 , y1 + y2/2)
=(-8 + 4/2 , 2-(-2)/2)
=(-4/2 , 2+2/2)
(-2 , 2)
(3 , 7) = (x1 , y1)
(9 , 2) = (x2 , y2)
distance of PQ = 
=
=
=
=
=7.8 unit
This function, y=8x+7 is linear with a slope (m) =8.
Any other function with slope m = 8 could be the other equation
Example:
y=8x+10
y=8x-5/3
y=8x+10,000
etc.
In short there are an infinity of function