SOLUTION: I am not clear about functions, so I need help figuring this out. Could someone please help? Which of the following is not a function of x? y=x^2+5x+3 y-3=6x 6x= -y^2+3 0=5x-y

Question 54185: I am not clear about functions, so I need help figuring this out. Could someone please help?
Which of the following is not a function of x?
y=x^2+5x+3
y-3=6x
6x= -y^2+3
0=5x-y+1
Answer by funmath(2933) (Show Source): You can put this solution on YOUR website!
The way that I attack these is to look at the exponents of the y's. If y is raised to an even integer power, x is not a function of y.
Therefore, is not a function of x because y is raised to the 2nd power and 2 is even.
Graphically, even powers of y's are represented by ellipses, circles, sideways parabolas (which is what this one is) and certain types of hyperbolas that are not functions because they do not pass the vertical line test.
Happy Calculating!!!
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