1. Suppose that y varies directly as x, and that y = 45 when x = 5. (a) Find the constant of variation & and the equation of variation that relates x and y (b) Find the value of y when x = 20 2. Suppose that y varies inversely as x, and that y = 20 when x =5. (a) Find the constant of variation k and the equation of variation that relates x and y. (b) Find the value of y when x = 10. 3. The weight of an object above the surface of the Earth varies inversely with the square of its distance to the center of the Earth. If an object weighs 50 pounds when it is 3960 miles from the center of the Earth, what would its weight be when it is 3975 miles from the center of the Earth