Answer:
1 hr 38 min
Step-by-step explanation:
The start time is 7:20. The end time is 8:58.
When 1 hour passes by, the time is 8:20.
8:58 - 8:20 = 38 minutes
1 hour and 38 minutes passes by.
You have already done half of it. Now substitute for x1 = 4 and y = 5
y - 5 = 6/7(x - 4)
Multiply everything by 7 to remove fractions
7y - 35 = 6(x - 4)
7y - 35 = 6x - 24
-6x + 7y = -24 + 35
-6x + 7y = 11
Some people prefer a positive number in front of x so multiply by -1
6x - 7y = -11
You can check the answer by testing it works for both of the original points
6x4 - 7x5 = 24 - 35 = -11 true
6x-3 - 7x-1 = -18 - -7 = -11 true
31 because it is adding 2 to each number