book Maths Puzzle Numerical Ability

5x-9=15-x

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What interest will you pay on a $7900 loan for 1 year if the interest rate is 11%? 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