After crossing a bridge Ivan drives at a constant speed. The graph below shows the distance (in miles) versus the time since be crossed the bridge (in hours) Use the graph to answer the questions

(a) How much does the distance increase for each hour since Ivaan crossed the bridge .
Answer : from reading our graph we can see that Ivan was at 0 distance before he crossed , after 1 hour, he is at 50 miles distance .
( after 2 hours he is at 100 miles etc. )
Distance at (2 hours ) - Distance at 1 hour = 100 -50 = 50 miles .
• so, Ivans speed increses at 50 miles per each hour travelled.
(b) Finding a slope:
Lets take any corresponding two points on the line, I will take coordinate (7;350) and ( 3; 150)
m = (y2-y1) / (x2 -x1)....
( substitute the above coodinates into the equation)
m = (150-350 ) / (3-7)
m = -200 /-4
m= 50
This means the slope is 50 miles per hour