Find four relations from {a, b} to {x, y} that are not functions from {a, b} to {x, y}.

The answer is below.

Step-by-step explanation:

In order a relation from {a, b} to {x, y} to be a function, each element of {a, b} has to be mapped to one value in {x, y}.

{(a,x)} is not a function since the there is no relation defined from the element b of the set {a,b} to the set  {x, y}

{(b,x)} is not a function since the there is no relation defined from the element b of the set {a,b} to the set  {x, y}

{(a,x),(a,y)} is not a function since the element a of the set {a,b} is mapped two distinct element of the set  {x, y}

{(b,x),(b,y)} is not a function since the element b of the set {a,b} is mapped two distinct element of the set  {x, y}

16

step-by-step explanation:

2 x 40 = 80

80/5

= 16

5x+2x=49

7x=49

x=7. 35 apples