Asked by Confused Child
The distance remaining for a half marathon race over several minutes is shown in table. Use the information to determine the constant rate change in the minutes per mile.
Table:
Time (min) Distance Remaining (mi)
40 8
56 6
72 4
88 2
Table:
Time (min) Distance Remaining (mi)
40 8
56 6
72 4
88 2
Answers
Answered by
Steve
If the rate is constant, then
t = md+b
Now plug in two pairs of values, say the first two.
8 = 40a + b
6 = 56a + b
So, a = -1/8 and b=13
t = -1/8 d + 13
Now check the other two pairs of values to make sure they agree.
t = md+b
Now plug in two pairs of values, say the first two.
8 = 40a + b
6 = 56a + b
So, a = -1/8 and b=13
t = -1/8 d + 13
Now check the other two pairs of values to make sure they agree.
Answered by
Adrian
time = (distance-13)/-.125
ex. (8 + -13)/-.125 = 40
(6 + -13)/-.125 = 56
ex. (8 + -13)/-.125 = 40
(6 + -13)/-.125 = 56
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