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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exam Other Question
What is Non-terminating and Terminating?(step by step) Can someone, please, show why is this equation true:


{{{sum((matrix (2, 1, n+i, i)), i=0, k) = (matrix (2, 1, n+k+1, k))}}}


Thanks!