exam Maths Puzzle Numerical Ability

dawn is 15 years old today. this is 5 times as old as her sister eve was when dawn was the age that eve is today. how old is eve?

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exam Other Question
how do you do this problem:
-4x+5y+-11
2x+3y=11

The answer in the book is(4,1), and I do not understand how to get that.
Can you please explain?

Thank you! Y=X-7
4X-7Y=10

FIND X AND Y SOLUTION