What is the domain of the following equation?please help, i wont be able 2 go 2 my party 2morrow if i dont?

Question

solve these!!!!!!!!!!!!!!!!!!
What is the domain of the following equation?

3x - 7y = 13

sorry, but i really dont get these!!!!!!!!! if you can help, PLEASE DO!!!!!!!!!!!!! i am frantic, i wont be able to go to my party unless i get these questions, and i seriously dont understand them!!!! please give the correct answer with detailed explanations of your work!!!!!!! THANK YOU SOOOOOO MUCH!!!!!!!!!!!
these are the answer choices

a)The set of real numbers

b)7/3

c)All positive real numbers.

d)No real numbers.

Answer 1

The domain of any function or equation is the set of all x values that you are allowed to use. For example, if you have y = 1/x, you can't use 0 since you're not allowed to have a fraction with a 0 denominator. In this case, your domain would be all real numbers except 0.

In your equation, there isn't anything that isn't allowed - x can be anything and you wouldn't be violating any math rules. So your answer would be all real numbers, (a).