Rate of Change Answers

The equation of this type of line is y = kx. What is special about k?

Mark’s cost does not vary directly with time spent talking because the cost for t = 0 is undefined✔ the cost of 0 hours is not 0 dollarsthe C-intercept is 0

Base on these results, the runner ran at a rate between 0.5 and 2 hours than between 1.5 and 2.5 hours.

The ratios

therefore, the points in the table form a direct variation.