exam Maths Puzzle Numerical Ability

hi, i need some help with these equations and if possible express the answer as on ordered pair....

x-y=4
2x+y=5

thanks in advance for the help!!

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exam Other Question

can you help me? This questions is a logarithm it is
Loga under the square root of m^6 n^13 over a^8 B^5. I know this one is simple but I am not sure what the procedure is to get the answer.