Which system of equations has no solutions? 1. x-3y+3z=-4
2x+3y-z=15
4x-3y-z=19

2. 3x-3y+4z=6
-3x+3y-4z=-6
6x-6y+8z=12

3. -2a-4b+6c=5
-a+3b-2c=-1
a+2b-3c=1

4. x+y=9
y+z=7
x-x=2

Nancy walks 5 blocks to the right, 3 blocks down, 7 blocks to the left, and 1 block up. each square's side length is 1 block. what are the coordinates of her new position? starting coordinates are (2, -3) a. (1, 5) b. (0, -5) c. (-3, 0) d. (-6, -3) e. (-4,-4)