Question

Which equation represents a function?
y2 + x = 6
y4 + x3 = 3
y – x2 = 4
y2 – x2 = 7
y2 + x2 = 7

Answer 1

Any ideas?

Answer 2

I have no idea I havent been to school for 2 months so I am behind

Answer 3

Do you have a textbook?

Answer 4

its a online recovery so I dont

Answer 5

May I suggest using YouTube, especially the Khan Academy will help you catch up.

Answer 6

You need a definition of the word "function", at your level.... right?

Answer 7

Remember in a function, every ordered pair must have a different first number.

Answer 8

So the best thing you can do is use a calculator or iPad or Wolframalpha.com to graph those equations and see which one passes the vertical line test.

Answer 9

or you could just sit here and wait for someone to tell you that the answer is

Answer 10

$$\Huge y - x^2 = 4$$

Answer 11

you have the right answer, but you can't do it on your own, right?