C. Solve for each of the following. Use any method. y varies directly as x. find the values as indicated. 1. If y = 12 when x = 4, find y when x = 12 2. If y = -81 when x = 9, find y when x = 7 3. If y=-3 when x=-4, find x when y = 2 4. If y = 3 when x = 10, find x when y = 1.2 5. If y = 2.5 when x = 7.25, find y when x = 4.75​