Please help asap! Thank you so much!! :)

One line passes through (-7,-4) and (5,4) . another line passes through the point (-4,6) and (6,-9)

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?

What is the slope of the line that contains the points (-5, 6) and (14. - 7)?