For the following expression, what value(s) of x can not be in the solution (restricted because you would be dividing by zero)? *Picture of expression included*

Tracy solved the following problem. which of the statements is true? 9 ÷ 3 + 6 × 2 3 + 6 × 2 9 × 2 18 her answer is correct. her answer is incorrect. she should have multiplied before dividing. her answer is incorrect. she should have multiplied before adding. her answer is incorrect. she should have added before dividing.

What can you determine about the solutions of this system

Does the point (1, sqrt 7) lie on circle shown.