Kim recorded the number of heartbeats of horses for different time intervals, on a scatter plot. She drew a line of best fit on the scatter plot, as shown below.
Straight line graph in the first quadrant shows ‘Time (in minutes)’ on the x axis and ‘Number of heartbeats’ on the y axis. The graph passes through the points (1, 44), (2, 88), (3, 132), (4, 176).
Which statement best describes the meaning of the slope as a rate of change for this line of best fit?
It represents the increase in a horse’s heartbeat with time.
It represents the time in which a horse completes a heartbeat cy

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