Question

Is the equation `y=x^2 +3` a function?

Answer 1

For each `x`-value, there is only one `y`-value.
It is a function.

Explanation:

This is the equation of a parabola. It does represent a function.

For any `x` value you choose, there will be only one `y` value.

You will not end up with a choice of `y`- values.

If you draw the graph and draw a vertical line anywhere, it will only intersect the parabola once. This is an indication that is is a function.