Question

Why are they not graphs of functions of x:

a) |y|=x

Answer 1

.
thats not a function. why? because (1,-1) and (1,1). functions have a 1 to 1 correspondence of x to y values

Answer 2

because for each value of x, there are more than one y value

Answer 3

Is that because it's an absolute function?

Answer 4

yes and no.