Answer:
x = -1, -10
Step-by-step explanation:
There is no real values for the square root of a negative value, therefore that negative domain does not exist for the function y=√(3x).
Already answered in the other one.
If there are choices, then you need to choose the correct choice, but if there are no choices, then one correct answer is to multiply the first equation by -2 and add it to the second equation to eliminate x and solve for y.