X is at (0,3) and is scaled by 2/3
Multiply both coordinated by 2/3
X' = (0*2/3, 3 * 2/3) = (0, 2)
Y is at (3,6) and is scaled by 2/3
Multiply both coordinated by 2/3
Y' = (3*2/3, 6 * 2/3) = (3, 4)
Z is at (-3,9) and is scaled by 2/3
Multiply both coordinated by 2/3
Z' = (-3*2/3, -9 * 2/3) = (-2, -6)