[63, 9] [14, 5] [21, 3] [26, ?]

What is the unknown in this pattern, show working please.

Look :

6 + 3 = 9 ===》 [ 63 , 9 ]

1 + 4 = 5 ===》 [ 14 , 5 ]

2 + 1 = 3 ===》 [ 21 , 3 ]

2 + 6 = 8 ===》 [ 26 , 8 ]

part a

x     y

0     8

1     7.5

2     7

3     6.5

4     6

5     5.5  

for every hour i deducted .5 inches from the length of the candle

part b

it is a function because for every x value there is only one y value

part   c

for every x value there is only one y value

x       y

0       8

1       7.6

2       7.2

3       6.8

step-by-step explanation:

combine all like terms then its just a 2 step equation