exam Maths Puzzle Numerical Ability

in need of help with solving this system: {x^2-100y^2=100
{x^2+ y^2=100
thanks for the help.

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The present age of a father exceeds 3 times the present age of his son by 2 years. Six years ago, the age of the father exceeded 4 times the age of the son by 4 years. Find the present ages of the son and the father. I need help with to simplify these: e^lnx^3 and e^ln x^16 thanks