book Maths Puzzle Numerical Ability

Is (2,3) the solution to the linear system defined by

y=3x-3
2x+4y=16

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book Other Question

I am having problems setting up this problem. The sum of the digits in a two digit number is 8. When the digits are reversed, the new number is 8 less than the original number. What is the original number? If A power of B + B to the power of A = 2044, wht are the values of A and B?