Book Maths Puzzle Algebra

I have been working on solving linear systems I cannot figure out where to move and mutilply the numbers my teacher taught us two ways combination and subsitution.here is one promblem and i was wondering if you could explain where to move the numbers and things because our teacher is of no help in this area and doesnt seem like she ever will be.
4x+y=-1
-5x-y= 0

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Book Other Question

After Mr. Stingy died, his lawyer read the will to his family. He left half of his estate to his wife, and $50,000 to his son. The remaining fortune was to be split in this way: half of what remained went to his caddy, half of what remained after that was set aside for the care of his pet iguana, and the remaining $8,000 went to his favorite charity. What was the value of Mr. Stingy's estate? Find the equation of the line parallel to y=5x-2 and passing through the origin.