Dear, the answer is as follows, please refer to it.

The original formula x-4y=- 1, both sides are x2 at the same time,

Available 2x-8y =-2—> ①

2x+y= 16 —>②

Use ①-② to get -8y-y=-2- 16.

The solution is y=2.

Substituting ②, we can get 2x+2= 16.

The solution is x=7.

I hope I can help you.