book Maths Puzzle Numerical Ability

Could u help me on finding the missing factors please

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I am having major problems solving by completing the square 2x^2-6x=5. I have no idea where to begin 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