5. Identify the relationship between coordinates of the ordered pairs.

AS x goes up by 2s, y goes dfdown by 1s

So I'm thinking I will start with    y=-(1/2)x

now what do I have

x      -(1/2)x

2         -1           1

4         -2           0

6        -3            -1

8        -4            -2

looks like I need to add 2

y=-(1/2)x+2

or  rearranged we get

y=2-(x/2)