SOLUTION: Which value is not in the domain of the function y=3/x a. -3 b. 0 c. 1 d. 6 Can you teach me how to do it. because i really dont know... and i need help with it...

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Question 136903: Which value is not in the domain of the function y=3/x
a. -3
b. 0
c. 1
d. 6
Can you teach me how to do it. because i really dont know... and i need help with it...
Found 2 solutions by solver91311, Earlsdon:
Answer by solver91311(24713) (Show Source):
You can put this solution on YOUR website!
The domain of a function is the set of all values for which the function is defined. If a value makes the function undefined, that value is excluded from the domain. If you divide by zero, the expression is undefined, so...

Answer by Earlsdon(6294) (Show Source):
You can put this solution on YOUR website!
The domain of a functionis the set of all possible values of the independent variable, that's x in this problem.
Of all the choices of answers, there is only one of them that cannot be used as the value for x. That one is x = 0.
Why, because if x were zero, then your function (equation) would be:
and division by zero is undefined in math and therefore not allowed.
So we say that x=0 is an excluded member of the domain.