book Maths Puzzle Numerical Ability

Please explain to me how this equation can be a function

x^2=1+y^2

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book Other Question

solve

The larger of two numbers is 2 more than 4 times the other. Their sum is 33. Their sum is 33. Find the two numbers.


solve the no-linear equation:


x+y =7
x^2+ y^2=25