We can see that for x = 0 that implies y = 10.
We can also see that for each x , y decreases 2 units, so the rate of change is -2.
The relation between x and y is a linear function:
y = 10 - 2x
Let's see if it is right.
For x = 0, we get
y = 10 - 2 . 0
y = 10
Ok!
For x = 1
y = 10 - 2 . 1
y = 10 - 2
y = 8
Ok!
For x = 2
y = 10 - 2 . 2
y = 6
Ok!
For x = 15
y = 10 - 2 . 15
y = 10 - 30
y = -20
Answer: start value: 0 ;
rate of change: -2,
relation between x and y: y = 10 -2x
