exam Maths Puzzle Numerical Ability

What is the domain and range of the following relation: r = (x + 2)/(x - 1)?

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exam Other Question

The sum of two numbers is 18 and their difference is 4. What are the two numbers? If fifteen less than two times a number is divided by six more than the number, the result is four less than 9 times the reciprocal of that number. Find the number