3y - yz = 2z i need a step but step to show my work and understand it

In the xy-plane, if the parabola with equation passes through the point (-1, -1), which of the following must be true?

Ineed no it anyone can see this

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?