book Maths Puzzle Numerical Ability

Sorry if this is the wrong topic for this problem.

Solve the system by addition.

5x-3y=13
4x-3y=11

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book Other Question

F(x)= x^2+2x+1
value of an:
I got a 1 for this answer but I'm not exactly sure if thats right. the sum of two numbers is 4, and their difference is 24. find the numbers.