I need to write a rule for these functions?

Question

1 ) x - 0,1,2,3

y - 3,5,7,9

2) x - 16,14,12,10

y- 7,6,5,4

I need to write a rule for these functions.

PLEASE HELP.

Answer 1

difference  = +2

y = 2x +3

check when x=3   2*3+3 = 9 yay

difference = -1

y = -1x + something

try  when x=17 y = 7

7 = -1*17+ something

7+16 = something= 23

so y =-1x+23 i'll leave u to do the check

Answer 2

1)2x+3=y

2)y=1/2x-1