In the second step, 8x was subtracted from both sides of the equation. This should give us
- 4y = 20 - 8x
- 4y = - 8x + 20
Dividing both sides of the equation by - 4, it becomes
- 4y/- 4 = - 8x/- 4 + 20/- 4
y = 2x - 5
The step was actually wrong though the final answer was correct
By following your step, the final answer should be y = 2x + 5 and this is wrong