book Maths Puzzle Numerical Ability

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?

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book Other Question

You are going to purchase two types of computers for your business. If computer A costs $700 and computer B costs $500, then how many of each should you buy if you need 16 computers and you have $10,000 to spend? Is (2,3) the solution to the linear system defined by

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