Hiking The scatter plot shows a hiker's elevation above sea level during a hike from the base to the top of a mountain. The equation of a trend line for
the hiker's elevation is y = 7.48x + 683, where x represents the number of
minutes and y represents the hiker's elevation in feet. Use the equation of the
trend line to estimate the hiker's elevation after 145 minutes.

b. 3/1    c. -1/3

Step-by-step explanation:

When a line is parallel to another they don't intersect and instead go in the same direction. Therefore they have the same slope

b. 3/1

When a line is perpendicular it has to be the negative reciprocal. This means that it you have to flip the numbers in the fraction and make it negative (unless it is already negative, then it becomes positive)

c. -1/3