exam Maths Puzzle Numerical Ability

the question is:
solve this system.

x-y=5
x2+y2=25

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exam Other Question

Graph: f(x) = 2x + 2.

Thanks for any help you can provide. Word problem:
There are 60 dimes and quarters in the drawer. Arny counted them and found that their total value was $8.70. How many coins of each type did Arny have?