6. Determine the radius of a circle with an area of 72 cm2 (round to 2 decimals). 7. Determine the number of solutions to each system of equations below. The number of solutions can be: 0, 1, or infinite. Reminder: You need to compare the slope and y- intercept of the equations to determine the number of solutions the system has. a b. c. y = 3x - 5 3y = 9x - 15 8. Graph the following systems of equations, then determine its solution. a. y = -2x +3 Solution: b. y = =x Solution: y=$x-2 y = x- 6