Question

Which of the following represents a function?

a. x^2+y^2=49

b. y=|x|

c. x= [ [y] ]

d. x=y^2

Answer 1

I think c is because the other ones are either an abosolute value equation or like a parabola possibly d. because for a x and y are either 7 or -7, not a function b is an absolute value I think d ight work for any real number. C is my final answer but the x should have been f(x)