What is the image of (9, 3) after a dilation by a scale factor of 3 centered at the origin?

The vertices of a rectangle are given in the columns of the matrix . if is found to perform a transformation, what are the coordinates of the transformed rectangle? (0, 0), (0, –3), (–3, –3), (–3, 0) (0, 0), (0, 3), (3, 3), (3, 0) (0, 0), (0, 3), (–3, –3), (–3, 0) (0, 0), (0, 3), (–3, 3), (–3, 0)

Whats the name of the vertical axis

What is the solution to this system of equations? y= 2x - 3.5 x - 2y = -14