contestada

Which of the following shows the system with like terms aligned?

-4x - 0.4y = -0.8
6x + 0.4y = 4.2

-4x + 0.4y = 0.8
6x + 0.4y = 4.2

-4x + 0.4y = -0.8
6x + 0.4y = 4.2

-4x + 0.4y = -0.8
6x - 0.4y = 4.2