Book Maths Puzzle Algebra

4/3x-y=4
3/4x-y=1/2
How do I find the solution to each system by addition and check the problem?

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Book Other Question

Hi, I am trying to find the vertex, y-intercept, domain and range of the following equation:
y= -x^2-20x-3

when I try to fing the x cordinate of the vertex I get 303??? Is that Suppose a radioactive substance loses half of its remaining mass each day. How much of a 36 gram sample will remain after 6 days?