exam Maths Puzzle Numerical Ability

solve the system: x^2-144y^2=144
x^2+y^2=144

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exam Other Question

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M to 4power(N-3power)/M-2 power)-3power N 0 power (M-4 power N8power)2 power/(N8 power M-2 power)2power John Craig invested a portion of $15,000 at 10% annual interest and the balance at 6% annual interest. If he earned $1260 for the year from the two accounts, how much did he invest at 10%?