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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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...

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.