What is the slope of the line passing through the points (2, - 5) and (4, 1)?

What is the point-slope equation of a line with slope -5 that contains the point (6,3)

Water flows at a steady rate from a tap. its takes 40 seconds to fill a 4 litre watering can from the tap. the rate at which water flows from the tap is halved. complete: 4 litres into cm3

Which best explains why this triangle is or is not a right triangle ?