In 75 minutes you travelled 30 kilometers, so the rate is 30/75=0.4km/minute
another way is to use the two points to find the slope: m=(30-0)/(75-0)=0.4
Y=4x-14 to find the slope you need to do
rise/run and to find b you need to see where the line crosses the y axis
Answer: The answer would be 8.2
45 to get j by itself you need to multiply both sides by 9