Need answer has soon has possible no need to explain
2 answers:
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for an expression or relation to be a function, it must not have any x-coordinate values repeated, let's check this one
A) 
B)
C)
D)
You were correct, the exact answer is A. The others do not equal 23 besides that one. Good job!
B)
C)
D)
You were correct, the exact answer is A. The others do not equal 23 besides that one. Good job!