Answer:
5. D (4,6)
6. B (7.8)
Step-by-step explanation:
5. Add the two X coordinates (6+2) and divide that by 2 (8/2=4), do the same for the two Y coordinates (4+8=12, 12/2=6)
6. Use the distance formula 
Input the coordinates 
Run is the horizontal change between points. Run in slope means the change in "x" .
Any answer less than one would work, soothe answers are A and D
Answer:
y = 125x + 500
Step-by-step explanation:
y = mx + b
y = ( (100 - 500) / (2014 - 2010) ) * x + 500
y = (500 / 4) * x + 500
y = 125x + 500