Match each function formula with the corresponding transformation of the parent function y = -4x.

1. y = 4 x
translated left by 1 unit
2. y = -4 x - 1
reflected across the y-axis
3. y = -4 x + 1
translated down 1 unit
4. y = -1 - 4 x
translated right by 1 unit
5. y = -4 -x
reflected across the x-axis
6. y = 1 - 4 x