book Maths Puzzle Numerical Ability

This question is actually about elimination because there werent any catorgories for elimination. My question is:
3x+y=1
5x-y=1

Thanks for the help!

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book Other Question

I NEED TO SET UP AN EQUATION FOR THIS WORD PROBLEM:
THE DIFFERENCE OF TWO NUMBERS IS 7, AND THEIR SUM IS 49. FIND THE TWO NUMBERS. Mr. Jones is 4 years older than his wife and 31 years older than his son. their ages add up to a total of 82 years. Find how old Mr. Jones is and the ages of his wife and son.