exam Maths Puzzle Numerical Ability

Hi! I need help solving the following equation.
2x+y=10
x^2+y^2=25
Thanks so much

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exam Other Question

Please help me solve this problem: A boat goes downstream a distance of 5 miles in 15 minutes, but it takes 20 minutes for the return trip. Find the right of the boat in still water and the rate of the current. 2 times a number, increased by 4, is 12. Find the number