Answer:
1. Yes
2. Yes
3. No
6. Yes
7. No
See descriptions and reasons why below.
Explanation:
A function is a rule that assigns exactly one output to every input. This means that no input value (x value) can repeat and have different output values *y values).
1. Output values repeat for different input values. This is a function still.
2. Quadratic equations for a U shape graph and do not have repeating inputs so it is still a function.
3. A circle is not a function. It has repeating inputs. Draw a vertical line down through the circle. It intersects at more than one point. Not a function.
4. Not readable in the picture.
5. Not readable in the picture.
6. Yes it is a function. Draw a vertical line and it intersects only once. Therefore, it has no repeating inputs.
7. Not a function. The x values or inputs repeat 25 and 36 with different output values each time.