What is the angle of rotation of a Circle ?​

Solve this system of equations. 12x − 18y = 27 4x − 6y = 10

50 will mark show all use the linear combination method to solve the system of equations. explain each step of your solution. if steps are not explained, you will not receive credit for that step. 2x+9y= -26 -3x-7y=13

Give another definition of variability and explain how it can be calculated.