Answer:
3: B
4: D
5: D
6: B
Step-by-step explanation:
3: A function has only one y value per x value, so it can't be W, X, or Z, it has to be Y which is B
4: Vertical line test ensures that every x value only has up to 1 y value.
In W, a vertical line intersects that circle twice
In X, a vertical line intersects the wave infinite times
In Z, a vertical line intersects the sideways parabola twice
In Y, there is an asymptote but at every point a vertical line only intersects once, so the answer is D
5:
Not A because there are 2 y values for 0
Not B because there are 2 y values for both 2 and 3
Not C because there are 2 y values for both 2 and 3
There is no problem in D
6:
This is obviously a relation so it has to be either (a relation) or (a relation and a function)
We can see that every x-value has a single y-value so it has to be a function
It is both a relation and a function
