HELP ME ASAP!!

Which of the following tables represents a function?

x 1 −1 4 −4
y 8 8 10 10

x 2 2 3 3
y 6 −6 7 7

x 5 −5 5 −5
y 10 11 12 13

x 2 2 7 7
y 2 3 4 5

1)  x 1 −1 4 −4

   y 8 8 10 10

Step-by-step explanation:

x 1 −1 4 −4

y 8 8 10 10

When each input in set x has exactly one output in set y, the relation is a function.

ALL OF THESE ARE NOT FUNCTIONS

x 2 2 3 3         number 2 has 2 different outputs → not a function

y 6 −6 7 7

x 5 −5 5 −5     number 5 and -5 have 2 different outputs → not a function

y 10 11 12 13

x 2 2 7 7      2 and 7 have 2 different outputs → not a function

y 2 3 4 5

a; x = 0.5

step-by-step explanation:

-10x = -5

x = 0.5

i think the amount would be $140.62