Answer:
The correct answer is (b).
Step-by-step explanation:
A line is parallel to the 
axis if it has a slope equal zero. Then if we compute the slope of the line that joins the points 
then
This implies that the line which that joins this points is parallel to the x-axis.
Observe that the slopes of the lines corresponding to the other items are nonzero.
Answer: 3.75
Step-by-step explanation: 15 divided by 4 equals 3.75
Answer:
4 V + 4 (V - 60) = D where D is distance apart after 4 hrs
8 V - 240 = 7304
V = 943 km/hr
and V2 = 943 - 60 = 883 km/hr where second plane is 60 km/hr slower
