+1 medal and +1 fan if you help!!! Which of the following expressions represents a function? A: y=x^2 B: {(9,2), (4,-2), (5,3), (9,-4)} C: x=-3 D: x^2=25-y^2

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+1 medal and +1 fan if you help!!! Which of the following expressions represents a function? A: y=x^2 B: {(9,2), (4,-2), (5,3), (9,-4)} C: x=-3 D: x^2=25-y^2

Mathematics
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which one passes the vertical line test?
a parabola points on a plane a vertical line or a circle??
A function has ordered pairs where x - elements have only ONE y - element

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Other answers:

The second option has x = 9, where it gives two different y values so it's not a function
Use a vertical line test @The_Yee_Dinosaur if the line goes through every point only once then it is a function otherwise it's not
So a circle would not be a function, if you do the vertical line test the following would happen |dw:1435960737269:dw| see how the lines are going through two points, we can conclude it's not a function.
Anyways, x = -3 is a vertical line so that is not a function, as it's go through more than one point.
That leaves us with only one option being a function.
so @Astrophysics your saying that the answer is A: y=x^2? Because that was my first guess.
Yup :)

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