book Maths Puzzle Numerical Ability

b+(b+5)-2(b-5)=18+b

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Having trouble This Problem in my Algabra class.
The problem is
Which of the ordered pairs
(-1, 2), (7, 0), (3, -1), (-17, 6)
are solutions for the equation x + 4y = 7?


Thnks you
The sum of the digits of a two digit number is 15. If the digits are reversed, the new number is 27 less than the original number. Find the orginal #