exam Maths Puzzle Numerical Ability

what is the domain of the following equation?
3x-y=13

A. the set of all real numbers
B. 7/3
C. all positive real numbers
D. No real numbers

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exam Other Question

I have a homework question that I do not know how to do. It states:
Graph the solution set y<or equal to (x+5)
y<2 When x is 2 or greater, the graph is the line y = x+4; when x is less than 2, the graph is the line y =3x.

Thank you to anyone who can help