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# Functions Exercises

### Example 1

Is the following relation a function? If not, why?

{(Juan, escuela), (Mariposa, escuela), (Fernando, casa), (Maria, tienda)}

### Example 2

Is the following relation a function? If not, why?

{(Juan, escuela), (Mariposa, escuela), (Juan, casa), (Maria, tienda)}

### Example 3

Is the following relation a function? If not, why?

{(1, 1), (1, 2), (1, 3)}

### Example 4

Is the following relation a function? If not, why?

{(1, 1), (1, 1), (2, 3)}

### Example 5

Is the following relation a function? If not, why?

y = 3x2 + 4

### Example 6

Is the following relation a function? If not, why?

x = |y|

### Example 7

Is the following relation a function? If not, why?

x = y2 where y is positive.

### Example 8

Is the following relation a function? If not, why?

x2 = y2