Please help me with this

Solve the system of equations y= 3/2 - 1, -x+ y =-3

Which of the functions graphed below has a removable discontinuity?

The domain of a function can be represented by which one of the following options? o a. a set of output values o b. a set of f(x) values o c. a set of input values o d. a set of both input and output values