exam Maths Puzzle Numerical Ability

I need help with the following question. The problem needs to be solved using subsitution. The answer that I got does not agree with the answer in the book.

y=x^2
x^2+y^2=1

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graph
x-4y=8
I can not figure out how to do algebric word problems. Not one.

If 2 is added to five times a number, the result is equal to 5 more than four times the number. find the number.