What is the rate of change of y with respect to x?

Which shows the pre image of triangle xyz

Starting at home, emily traveled uphill to the hardware store for 606060 minutes at just 666 mph. she then traveled back home along the same path downhill at a speed of 121212 mph. what is her average speed for the entire trip from home to the hardware store and back?

Def rotates 90 clockwise about point a to create d’ e’ f’. therefore, which equation must be true ?