The scatterplot above shows the speeds of different runners over time.
Which of the following could be the equation of the line of best fit?
A . S = C2 × (t C 15)
B . S = Ct + 25
C . S = C1/2 × (t C 10)
D . S = C1/2 × (t C 20)
E . S = 2 × (t + 15)
Answer: A
Explanation:
If a straight line were drawn through as many of the plotted points as possible, it would have a negative slope. The line slopes more sharply than the line y = Cx × (a line with a slope of C1), so the line would have a slope more negative than C1. The line would also have a y-intercept well above the x-axis. The only equation given with a slope more negative than C1 is S = C2 × (t C 15).
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