exam Maths Puzzle Numerical Ability

how do you graph this function f(x)= {x-1}+4

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What is the domain and range of the following relation: r = (x + 2)/(x - 1)? Fax paper costs $17.00 per case and copier paper costs $11.00 per case. If an order is recieved for a total of 250 cases for $3,659.00 what is the excat number of cases of copier paper?