Answer:
0
Step-by-step explanation:
We have two points, so we can use the slope formula
m = ( y2-y1)/(x2-x1)
= (4-4)/(4-8)
= 0/-4
zero
(4-4) / (8-4) = 0/4
slope is zero which means it is a horizontal line which crosses the y-axis at 4
