Determine If the Equation Specifies a Function with Independent Variable

Short Answer

Determine if the equation specifies a function with independent variable x. If so, find the domain. If not, find a value of x to which there corresponds more than one value of y:
-xy + 3y = 1
A) A function with domain all real numbers except x = -3
B) Not a function; for example, when x = 1, y = ±3