A) Table D does not represent a function as y can't have two different values for the same value of x.
B) Table A and C.
Answer:
All the real numbers except 0
1) Solve one of the equations for either variable.
2) Substitute the expression from Step 1 into the other equation.
3) Solve the resulting equation.
4) Substitute the solution in Step 3 into one of the original equations to find the other variable.
5) Write the solution as an ordered pair.