Home » Test Prep » ACT Section 2: Math » Which of the following could be the equation of the line of best fit?
and and and , 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 = -2 x (t – 15)
B. S = -t + 25
C. S = -1/2 x (t – 10)
D. S = -1/2 x (t – 20)
E. S = 2 x (t + 15)
Correct Answer: A
Explanation/Reference:
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 = -x x (a line with a slope of -1), so the line would have a slope more negative than – 1. The line would also have a y-intercept well above the x-axis. The only equation given with a slope more negative than -1 is S = -2 x (t – 15).
|
Download Printable PDF. VALID exam to help you PASS.
|
 |
