Joseph plots the speed of his car and time on a scatter plot. The equation for the line of best fit on his scatter plot is y = -15x + 60, where x is the time in hours and y is the speed in miles/hour. Which statement describes the situation correctly?

Question

ovidia · Answer

The initial speed is 60 miles/hour, and his speed decreases by 15 miles/hour every hour.



The initial speed is 60 miles/hour, and his speed increases by 15 miles/hour every hour.



The initial speed is 0 miles/hour, and his speed increases by 15 miles/hour every hour.



The initial speed is 5 miles/hour, and his speed increases by 30 miles/hour every hour.

jiteshmeghwal9 · Answer

Y=-15x+60
At x=0 why is y?

jiteshmeghwal9 · Answer

What*

dumbcow · Answer

Initial value occurs when x = 0,  If x=0, what will y be?

If slope is positive, then speed is increasing, otherwise speed is decreasing. 
Is the slope of line positive or negative?

jiteshmeghwal9 · Answer

Also differentiating the given expression will give you acceleration which is rate of change of speed

ovidia · Answer

negative/