Have a go at graphing
What do you notice?
I am just completely stuck on these problems. I am sort of making headway, but I am still confused.
I know the fundamentals of domain, range, function... but I have no idea how to solve the equation to see if it is a function.
Best way to do any such problem is to start with the definition! The definition of "function" is: given a relation between x and y, y is a function of x if and only if for any value of x, there is, at most, only one corresponding value of y. Now look at x= 1. What values of y give [itex]y^2= 1[/itex]?