Yes, none of the X values repeat, therefore it is a function. X=0 is not a function though.
y = 0" the answer is YES.
y - |x| is an expression, not a function.
-2
A function.
x = 0 and y = 4
You can tell if an equation is a function if for any x value that you put into the function, you get only one y value. The equation you asked about is the equation of a line. It is a function.
The line with equation crosses the y-axis at (0, 0), so the y-intercept is 0. While the line with equation x = 1 does not cross the y-axis at all (it is parallel to it), so it has no y-intercept.
The [ 2x + 1 ] represents a function of 'y' .
Yes, the equation has a slope of 0.
a function
Yes.
Because when your solving a quadratic equation your looking for x-intercepts which is where why equals 0 and x equals what ever the answer is.