What is the result of adding these two equations? -2x+y=0 -7x+3y=2

The difference of 2 numbers is 21 and the quotient of the equation is 4 then what are the two numbers?

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

The volume of a cone is 37x3 cubic units and its height is x units. which expression represents the radius of the cone's base, in units? 1 s o 3x o 6x obx 93x2